Abstract:
A combination of an ashless dispersant comprising the reaction product of a succinic anhydride and a polyamine and an ashless rust inhibitor comprising a mixture of a succinic anhydride and a oxime substituted aromatic compound in a lubricant base stock along with a poly alkylene alcohol demulsifier provides a circulating oil composition having good demulsibility, deposit control and rust inhibition.

Description:
This application claims the benefit of U.S. Provisional Application(s) No(s).: 60/354,417 filed on Feb. 5, 2002. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates to lubricating compositions for industrial machinery and more specifically to circulating oil compositions. 
     BACKGROUND 
     The art of formulating lubricating oil compositions for industrial equipment has become more complex as a result of increased government and user environmental standards and increased user performance requirements. For example, many end users seek lubricants that do not employ metallic detergents and dispersants that are typically used to keep deposit-forming precursors in an oil away from working surfaces. Ashless or non-metal containing dispersants and detergents, however, tend to be effective in emulsifying water in the oil. Industrial oils such as gear, hydraulic, and circulating oils typically are required to be capable of separating from water in order that any water contamination arising during use does not adversely impact equipment operation and durability. Thus, additives that may enhance one property of a lubricating composition may adversely effect another property. 
     Another required property for industrial oils is rust inhibition. Again, some end users desire lubricant compositions that employ ashless rust inhibitors. Unfortunately, experience has shown that lubricants with ashless rust inhibitors are not as effective in inhibiting rust as lubricants using metallic sulfonate or metallic carbonate rust inhibitors. Thus use of an additive that may be environmentally desirable may result in a lubricating composition that does not meet certain specific performance requirements. 
     One object of the present invention is to provide an ashless industrial oil lubricating composition that has good water separability characteristics. 
     Another object is to provide an ashless lubricating composition that has good rust inhibition. 
     Yet another object is to provide an industrial oil composition that has good thermal and oxidative stability. 
     SUMMARY OF THE INVENTION 
     It has now been found that the combination of an ashless dispersant comprising the reaction product of a succinic anhydride and a polyamine and an ashless rust inhibitor comprising a mixture of a succinic anhydride and an aromatic oxime in a lubricant basestock along with a polyoxyalkylene alcohol demulsifier provides a composition having good demulsibility, deposit control and rust inhibition. Accordingly, in one embodiment, a lubricant composition is provided comprising: 
     (a) a lubricating oil basestock; 
     (b) an effective amount of an ashless dispersant comprising the reaction product of a polyalkenyl substituted succinic anhydride and a polyamine; 
     (c) an effective amount of an ashless rust inhibitor comprising a mixture of a alkyl succinic anhydride and an aromatic oxime; and 
     (d) an effective amount of a demulsifier comprising a polyoxyalkylene alcohol. 
     Other embodiments of the invention will become apparent from the detailed description which follows. 
     DETAILED DESCRIPTION OF THE INVENTION 
     The lubricating oil basestock comprises a major portion of the composition of the present invention and typically will be selected from any of the natural mineral oils of API Group I basestocks. Preferably, the basestock will comprise a mixture of Group I basestock of different viscosities which will be combined in proportions sufficient to meet a predetermined viscosity requirement. For example, a suitable basestock for a paper machine oil comprises a mixture of from about 20 to 80 wt % of a 2500 solvent neutral mineral oil and 600 solvent neutral mineral oil. The basestock can also comprise API Group II, Group III or Group IV basestocks or mixtures of any of Group I, Group II, Group III and Group IV basestocks. 
     The lubricating oil compositions of the invention includes an effective amount of a succinimide comprising the reaction product of polyalkenyl substituted succinic anhydride and a polyamine. Typically, the polyalkenyl group of the succinic anhydride will be selected from ethylene, propylene, butylene, isobutylene and pentene and preferably is a polyisobutylene group of from about 500 to about 2500 Mn and more preferably from about 900 to about 1000 Mn. Thus, the preferred polyalkenyl succinic acid anhydride is polyisobutylene succinic anhydride (PIBSA). 
     Among suitable polyamines used in forming the succinimide mention is made of ethylenediamine (EDA), diethylenetriaminime (DETA), triethylenetetramine (TETA) and tetraethylenepentamine (TEPA). Particularly preferred is TEPA. Thus, the preferred dispersant is PIBSA TEPA. 
     The method for reacting a polyalkenyl succinic anhydride with a polyamine is well known in the art. In general, the molar ratio of polyamine to polyalkenyl succinic anhydride is in the range of about 0.35:1 to about 1:1. 
     Preferably the reaction product is subjected to a postcure with cyclic carbonate, boric acid or a boric acid derivative. Postcure techniques are known in the art. In this regard see, for example, U.S. Pat. No. 4,612,132 which is incorporated herein by reference. 
     In general, the amount of dispersant will constitute from about 0.1 to about 5.0 wt % of the total weight of the composition and preferably from 0.2 to 2.0 wt %. 
     The lubricating oil composition of the invention, also includes an effective amount of a mixture of an alkyl substituted succinic anhydride and an oxime substituted aromatic compound. The alkyl substituted succinic anhydride may be represented by the formula 
                        
 
where R is a linear or branched alkyl group of from about 8 to about 20 carbon atoms. Preferably R is a branched alkyl group of from 12 to 14 carbon atoms.
 
     The oxime substituted aromatic compound may be represented by the formula 
                        
 
where R 1  is H or 
                         
 
and R 2  is an alkyl group of from 5 to 15 carbon atoms.
 
     Typically, molar ratio of alkyl substituted succinic anhydride to aromatic oxime will be in the range of about 1:1 to about 10:1 and preferably about 2:1 to about 4:1. 
     The amount of the ashless rust inhibitor employed typically will be in the range of from about 0.1 to about 3.0 wt %, and preferably from 0.2 to 1.5 wt % based on the total weight of the composition. 
     The lubricant composition of the invention also includes an effective amount of a polyoxyalkylene alcohol demulsifying agent. A particularly suitable polyoxyalkylene alcohol demulsifying agent is characterized by the formula 
                        
 
where EO is an ethylene oxide moiety, PO an propylene oxide moiety and x and y represent the relative amounts of each. A preferred demulsifying agent will have a Mn in the range of about 1700 to 3000 and an EO/PO ratio of from about 20:80 to about 1:99. Typically, the polyoxyalkylene alcohol demulsifying agent is dissolved in a solvent such as tricresyl phosphate (TCP). Especially useful is a solution comprising from 75 to 99 wt % TCP.
 
     In general, the demulsifying agent will be used in an amount ranging from about 0.001 to about 0.1 wt % based on the total weight of the composition. 
     Optionally, the composition may also include one of the various types of lubricant thickeners well known in the art. An example of one such thickener is polyisobutylene. Thus, in one embodiment the composition of the invention may include 0 wt % up to about 25 wt % of a thickener. 
     Other conventional additives which may be used in the lubricants of this invention include oxidation inhibitors, antiwear agents, metal passivators, antifoam agents and the like. 
     Examples of antiwear agents, that may be used, include alkylated dithiocarbamates, alkyl phosphates, aryl phosphates, thiophosphates, amine phosphates and dithiophosphates. 
     The composition may include one or more metal passivators selected from alkylated benzotriazole, tolyltriatole, and dimercaptothiodiazole. 
     One or more oxidation inhibitors also may be used in the lubricants of this invention including diphenyl amines, phenyl alpha naphthyl amines, and hindered phenolic type. 
     One or more antifoam agents may be used in the lubricants of this invention, including polydimethylsiloxane and polymethacrylate. 
     The above mentioned additional additives are used in amounts sufficient to provide their normal function. Typical amounts for individual components in a preferred lubricant composition is given in Table 1. 
     
       
         
               
               
               
               
             
           
               
                 TABLE 1 
               
               
                   
               
               
                   
                   
                 Broad 
                 Preferred 
               
               
                 Component 
                 Composition 
                 wt % 
                 wt % 
               
               
                   
               
             
             
               
                 Base stock 
                 2500 solvent neutral 
                 1.0-99  
                 20.0 -60.0 
               
               
                   
                 600 solvent neutral 
                 1.0-99  
                 40.0 -70.0 
               
               
                 Ashless dispersant 
                 PIBSA-TEPA 
                 0.1-5.0 
                 0.2 -2.0 
               
               
                 Ashless rust 
                 Aromatic 
                 0.1-3.0 
                 0.2-1.5 
               
               
                 inhibitor 
                 oxime/alkylated 
               
               
                   
                 succinic anhydride 
               
               
                 Demulsifier 
                 Ethylene oxide- 
                 0.001-0.1  
                 0.005-0.05  
               
               
                   
                 propylene oxide 
               
               
                   
                 alcohol 
               
               
                 Anti-wear agent(s) 
                 miscellaneous 
                 0.1-5.0 
                 0.5 -1.5 
               
               
                 Metal passivator(s) 
                 miscellaneous 
                 0.01-1.0  
                 0.05-0.20 
               
               
                 Thickener 
                 miscellaneous 
                  0.0-25.0 
                 1.0-5.0 
               
               
                 Anti foam agent(s) 
                 miscellaneous 
                 0.0001-0.1   
                 0.001-0.01  
               
               
                   
               
             
          
         
       
     
    
    
     EXAMPLES 
     The following examples are presented to further illustrate the invention. 
     Test Procedures 
     The lubricating compositions set forth in the Tables 2 to 5 were tested according to the following procedures: 
     Deposit Control 
     Bearing Rig Test (BRT) 
     In the BRT test, the oil is circulated through steam heated spherical roller bearings. Water is added periodically to simulate moisture contamination in service. At test completion, the bearing rollers, cage and raceways are rated for deposits using the CRC varnish rating scale. 
     Property Retention Test (PRT) 
     In the PRT test, the oil is circulated with a gear pump at moderately high temperature and pressure for 2000 hours. In addition to the temperature and pressure, multimetal catalysts and periodic water contamination are used to simulate oil stress in service. The oil reservoir, the metal catalysts, and an in-line screen mesh filter are observed periodically for deposits. The physical properties of the oil are also measured periodically. 
     Antiwear 
     FZG scuffing test, DIN 51354 
     Rust and Corrosion Protection 
     Rust test with synthetic sea water, ASTM D665B 
     Copper strip corrosion test, ASTM D130 
     SKF Emcor Rust Test, IP 220 
     Thin Oil Film Inhibition Test, commonly known as the TOFI test. 
     In the TOFI test, polished steel panels are immersed in test oil and exposed to 100% humidity at 140° F. The test continues until 5% of the steel panel surface is covered with rust. Many oils that pass ASTM D665B will show some rust formation in the TOFI test. 
     Water Separability 
     ASTM D1401 
     ASTM D2711 
     Filterability 
     Pall Filtration 
     AFNOR Filtration, wet and dry methods 
     Oxidation Stability 
     RBOT, ASTM D2272 (now called RPVOT) 
     TOST, ASTM D943 
     Comparative Example 1 
     These ashless oil compositions were formulated having the ingredients shown in Table 2. As can be seen, formulation 1 and 2, which include a dispersant, have poor demulsibility, whereas formulation 3, without dispersant has good demulsibility. 
     
       
         
               
               
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
               
             
           
               
                 TABLE 2 
               
             
             
               
                   
               
               
                 Component 
                   
                 Formulation 
               
             
          
           
               
                 Function 
                   
                 Component Description 
                 1 
                 2 
                 3 
               
               
                   
               
             
          
           
               
                 base stock 
                   
                   
                 2500 solvent neutral 
                 35 
                 35 
                 40 
               
               
                 base stock 
                   
                   
                 600 solvent neutral 
                 bal 
                 bal 
                 bal 
               
               
                 thickener 
                   
                   
                 polyisobutylene 
                 3.8 
                 3.8 
                 1.8 
               
               
                   
                   
                   
                 ashless borated 
               
               
                   
                   
                   
                 polyisobutylene-phenol + 
               
               
                 dispersant 
                   
                   
                 TEPA (Mannich Base) 
                 0.5 
               
               
                   
                   
                   
                 borated polyisobutylene 
               
               
                   
                   
                   
                 succinic anhydride reacted 
               
               
                   
                   
                   
                 with tetraethylpentamine 
               
               
                 dispersant 
                   
                   
                 (borated PIBSA-TEPA) 
                   
                 0.5 
               
               
                 rust inhibitor 
                   
                   
                 ester/amide/carboxylate compound 
                 0.5 
                 0.5 
                 0.5 
               
               
                 metal passivator 
                   
                   
                 alkylated benzotriazole 
                 0.05 
                 0.05 
               
               
                 antiwear 
                   
                   
                 amine phosphate 
                 0.2 
                 0.2 
                 0.2 
               
               
                 antiwear 
                   
                   
                 dithiocarbamate 
                 1 
                 1 
                 1 
               
               
                   
                   
                   
                 alkylated diphenylamine 
               
               
                 antioxidant 
                   
                   
                 amine 
                 0.15 
                 0.15 
                 0.15 
               
               
                 defoamant 
                   
                   
                 dimethylsiloxane polymer 
                 0.0005 
                 0.0005 
                 0.0005 
               
               
                 demulsifier 
                   
                   
                 ethylene oxide propylene 
               
               
                   
                   
                   
                 oxide polymer diluted 10% 
               
               
                   
                   
                   
                 in tricresyl phosphate 
                 0.1 
                 0.1 
                 0.05 
               
               
                 Properties 
                 Tests 
               
               
                 viscosity 
                 ASTM D445 
                 KV @ 40° C., cSt 
                   
                 232.1 
                 232 
                 219.5 
               
               
                 viscosity 
                 ASTM D445 
                 KV @ 100° C., cSt 
                   
                 19.59 
                 19.55 
                 18.76 
               
               
                 VI 
                   
                   
                   
                 96.2 
                 96.0 
                 95.3 
               
               
                 metals 
                 ASTM D5185 
                 Metals 
                 Ca, ppm 
                 &lt;2 
                 &lt;2 
                 &lt;2 
               
               
                   
                   
                   
                 Zn, ppm 
                 &lt;2 
                 &lt;2 
                 &lt;2 
               
               
                 demulsibility 
                 ASTM D1401 
                 180° F. 
                 minutes to 37 ml water 
                 &gt;60 
                 &gt;60 
                 10 
               
               
                   
                   
                   
                 minutes to 3 ml emulsion 
                 &gt;60 
                 &gt;60 
                 10 
               
               
                   
                   
                   
                 minutes to break 
                 &gt;60 
                 &gt;60 
                 10 
               
               
                 demulsibility 
                 ASTM D2711 
                   
                 % water in oil 
                 0.4 
                 0.4 
                 1 
               
               
                   
                   
                   
                 Total free water, ml 
                 0.2 
                 21.5 
                 38.2 
               
               
                   
                   
                   
                 Emulsion water, ml 
                 0 
                 11.5 
                 1.1 
               
               
                   
                   
                   
                 Total water, ml 
                 0.2 
                 33 
                 39.3 
               
               
                   
               
             
          
         
       
     
     
       
         
               
               
             
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 3 
               
             
             
               
                   
               
               
                 Component 
                 Formulation 
               
             
          
           
               
                 Function 
                 Component Description 
                 1 
                 2 
                 3 
                 4 
                 5 
               
               
                   
               
             
          
           
               
                 Base Stock 
                   
                   
                 2500 solvent neutral 
                 40 
                 40 
                 40 
                 40 
                 40 
               
               
                 Base Stock 
                   
                   
                 600 solvent neutral 
                 bal 
                 bal 
                 bal 
                 bal 
                 bal 
               
               
                 Thickener 
                   
                   
                 polyisobutylene 
                 1.5 
                 1.5 
                 1.5 
                 1.5 
                 1.5 
               
               
                 Antiwear 
                   
                   
                 amine phosphate 
                 0.2 
                 0.1 
                 0.1 
                 0.1 
                 0.1 
               
               
                   
                   
                   
                 borated polyisobutylene 
               
               
                   
                   
                   
                 succinic anhydride reacted 
               
               
                   
                   
                   
                 with tetraethylpentamine 
               
               
                 Dispersant 
                   
                   
                 (borated PIBSA-TEPA) 
                 0.5 
                 0.5 
               
               
                   
                   
                   
                 polyisobutylene succinic 
               
               
                   
                   
                   
                 anhydride reacted with 
               
               
                   
                   
                   
                 tetraethylpentamine (PIBSA-TEPA) 
                   
                   
                 0.5 
                 0.5 
                 0.3 
               
               
                 Antiwear 
                   
                   
                 dithiocarbamate 
                 1 
                 1 
                 1 
                 1 
                 1 
               
               
                 Antioxidant 
                   
                   
                 amine 
                 0.15 
                 0.15 
                 0.15 
                 0.15 
                 0.15 
               
               
                 Defoamant 
                   
                   
                 dimethylsiloxane polymer 
                 0.05 
                 0.05 
                 0.03 
               
               
                 Defoamant 
                   
                   
                 polymethacrylate 
                   
                   
                   
                 0.03 
               
               
                   
                   
                   
                 ethylene oxide propylene 
               
               
                   
                   
                   
                 oxide polymer diluted 10% 
               
               
                 Demulsifier 
                   
                   
                 in tricresyl phosphate 
                 0.15 
                 0.1 
                 0.15 
                 0.1 
               
               
                   
                   
                   
                 oximine/alkylated succinic 
               
               
                 Rust inhibitor 
                   
                   
                 anhydride mixture 
                 0.25 
                 0.15 
                 0.25 
                 0.35 
                 0.15 
               
               
                   
                   
                 blend appearance 
                   
                 C&amp;B 
                 C&amp;B 
                 C&amp;B 
                 C&amp;B 
                 C&amp;B 
               
               
                 viscosity 
                 ASTM D445 
                 KV @40° C. 
                   
                 225.3 
                   
                 215.8 
                   
                 218.6 
               
               
                 viscosity 
                 ASTM D445 
                 KV @100° C. 
                   
                 19.25 
                   
                 18.69 
                   
                 18.79 
               
               
                 VI 
                 ASTM D2270 
                 Viscosity Index 
                   
                 96.5 
                   
                 96.4 
                   
                 95.9 
               
               
                 TAN 
                 ASTM D664 
                 TAN, mg KOH/g 
                   
                 0.78 
                   
                 0.38 
               
               
                 Metals 
                 D5185 
                   
                 Ca, ppm 
                   
                 &lt;2 
                 &lt;2 
                   
                 &lt;2 
               
               
                   
                   
                   
                 Zn, ppm 
                   
                 &lt;2 
                 &lt;2 
                   
                 2 
               
               
                   
                   
                   
                 Final pressure (psi) 
               
               
                 rust 
                 ASTM D665 
                 ASTM Rust B 
                   
                   
                   
                 pass 
               
               
                 rust 
                 Mobil M1180 
                 TOFI, hours to 5% rust 
                   
                   
                 648 
                 528 
               
               
                 rust 
                 IP220 
                 SKF Emcor - distilled water 
                   
                   
                   
                   
                 0-0, 0-0 
               
               
                   
                 IP220 
                 SKF Emcor - acid water 
                   
                   
                   
                   
                 1-1+, 0-1 
               
               
                 demulsibility 
                 ASTM D1401 
                 180° F. 
                 minutes to 37 ml water 
                 10 
                 10 
                 20 
                 15 
                 &gt;60 
               
               
                   
                   
                   
                 minutes to 3 ml emulsion 
                 10 
                 10 
                 20 
                 10 
                 &gt;60 
               
               
                   
                   
                   
                 minutes to break 
                 10 
                 10 
                 25 
                 15 
                 &gt;60 
               
               
                 demulsibility 
                 ASTM D2711 
                 (EP Method) 
                 % water in oil 
                 0.2 
                 0.2 
                 0.3 
               
               
                   
                   
                   
                 total free water, ml 
                 84 
                 86 
                 86 
               
               
                   
                   
                   
                 emulsion water, ml 
                 2.2 
                 1.2 
                 0.6 
               
               
                   
                   
                   
                 Total water, ml 
                 86.2 
                 87.2 
                 86.6 
               
               
                   
                   
                   
                 Emulsion, ml 
                 0.4 
                 0 
                 0 
               
               
                   
               
             
          
         
       
     
     As can be seen from Table 2, ashless circulating oil formulations that include a dispersant tend to have poor demulsibility characteristics. 
     Example 1 
     Comparative Example 2 
     Five ashless circulating oil formulations were prepared having the ingredients and properties shown in Table 3. Formulations 1 to 4 are compositions according to this invention while formulation 5 is a comparison (Comparative Example 2) of a composition not having a demulsifier. 
     As can be seen, formulation 5, which does not contain a demulsifier, displays poor demulsibility characteristics. Also, compositions containing at least 0.3 wt % of the rust inhibitor display good performance in all the rust tests. 
     Example 3 
     Multiple, similar ashless circulating oil compositions were prepared having formulations in accord with the invention. The formulation of Table 4 is representative of these formulations. 
     
       
         
               
               
               
             
           
               
                 TABLE 4 
               
               
                   
               
               
                 Component Function 
                 Component Description 
                 Amount, wt % 
               
               
                   
               
             
             
               
                 Base stock 
                 600 solvent neutral 
                 balance 
               
               
                 Base stock 
                 2500 solvent neutral 
                 39% 
               
               
                 Rust inhibitor 
                 oxime/alkylated 
                 0.30% 
               
               
                   
                 succinic anhydride 
               
               
                   
                 mixture 
               
               
                 Dispersant 
                 PIBSA-TEPA 
                 0.5% 
               
               
                 Demulsifier 
                 Ethylene oxide 
               
               
                   
                 Propylene oxide 
                 0.1% 
               
               
                   
                 Alcohol in TCP 
               
               
                 Thickener 
                 polyisobutylene MW 1300 
                 20% 
               
               
                 Antiwear 
                 amine phosphate 
                 0.1% 
               
               
                 Antiwear 
                 dithiocarbamate 
                 1.0% 
               
               
                 Antioxidant 
                 amine 
                 0.15% 
               
               
                 Defoamant 
                 Dimethyl siloxane polymer 
                 0.0002% 
               
               
                 Metal passivator 
                 benzotriazole 
                 0.05% 
               
               
                   
               
             
          
         
       
     
     Typical properties for a composite of these multiple formulations is given in Table 5. 
     
       
         
               
               
               
               
             
               
             
               
               
               
               
             
               
             
               
               
               
               
             
               
             
               
               
               
               
             
               
             
               
               
               
               
             
               
             
               
               
               
               
             
               
             
               
               
               
               
             
               
             
               
               
               
               
             
               
             
               
               
               
               
             
           
               
                 TABLE 5 
               
               
                   
               
               
                          Test Method 
                 General Description 
                 Desired Value 
                 Results 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Chemical &amp; Physical Properties 
               
             
          
           
               
                 ASTM D445 
                 KV C 40° C., cst 
                 198-242 
                 220 
               
               
                 ASTM D445 
                 KV @ 100° C., cst 
                 17-21 
                 19.0 
               
               
                 ASTM D1500 
                 ASTM Color 
                 &lt;5 
                 L3.5 
               
               
                 ASTM D5185 
                 Metals by ICP 
               
               
                   
                 Ca, ppm 
                 &lt;10 
                 &lt;2 
               
               
                   
                 Zn, ppm 
                 &lt;10 
                 &lt;2 
               
               
                 Filterability 
               
               
                 Pall 
                 Dry Pall 
                 Pass 
                 Pass 
               
               
                 Filterability 
                 Volume Filtered (ml) 
                 &gt;2000 
                 &gt;2000 
               
               
                   
                 AFNOR Filterability 
               
               
                 AFNOR NF 
                 Dry AFNOR 
                 2 max 
                 1.1 
               
               
                 48690 
               
               
                 AFNOR NF 
                 Wet AFNOR 
                 2 max 
                 1.1 
               
               
                 48691 
               
             
          
           
               
                 Oxidation Stability &amp; Lube Life 
               
             
          
           
               
                 ASTM D943 
                 TOST life, hours 
                 &gt;3000 
                 3800 
               
               
                 ASTM 
                 RBOT (minutes) 
                 &gt;300 
                 420 
               
               
                 D2272 
               
             
          
           
               
                 Rust &amp; Corrosion 
               
             
          
           
               
                 ASTM D665 
                 ASTM Rust B 
                 Pass 
                 Pass 
               
               
                 ASTM D130 
                 Copper corrosion 
                 2 maximum 
                 1B 
               
               
                   
                 24 hours/100° C. 
               
               
                   
                 TOFI (Thin Oil Film 
                 &gt;200 
                 200+ 
               
               
                   
                 Inhibition) 
               
               
                   
                 hours to 5% rust 
               
               
                 IP 220 
                 SKF Emcor Rust Test 
               
               
                   
                 Dist. Water, brg. Rating 
                 1 maximum 
                 0—0 
               
               
                   
                 Acid water, brg. Rating 
                 1 maximum 
                 0—1 
               
             
          
           
               
                 Water Separability 
               
             
          
           
               
                 ASTMD 1401 
                 Demulsibility @ 82° C. 
                 30 max 
                 10 
               
               
                   
                 Mins to break 
               
               
                 ASTM D2711 
                 Demulsibility 
                 &gt;40 
                 41.7 
               
               
                   
                 Total water, ml 
               
             
          
           
               
                 Anti-Wear/Extreme Pressure 
               
             
          
           
               
                 ASTM D51354 
                 FZG Fail Stage 
                 12 minimum 
                 13 
               
             
          
           
               
                 Environmental Concerns 
               
             
          
           
               
                   
                 Zinc-Free 
                 Yes 
                 Yes 
               
               
                   
                 Ashless 
                 Yes 
                 Yes 
               
             
          
           
               
                 Rig Tests for Deposit Control and Lube Life 
               
               
                 Bearing Rig Test (BRT) 
               
             
          
           
               
                 proprietary 
                 Average rating (10 = clean) 
                 &gt;6 
                 7.28 
               
               
                   
                 % change KV @ 40 
                 &lt;8% 
                 2.2% 
               
               
                   
                 Sludge rating (10 = clean) 
                 &gt;9 
                 9.61 
               
             
          
           
               
                 Property Retention Test @ 70° C. (PRT) 
               
             
          
           
               
                 proprietary 
                 Hours to filter 5 
                 &gt;2000 
                 2000+ 
               
               
                   
                 Filter rating 2000 hours 
                 &gt;5 
                 8.6