DRAFT UGANDA STANDARD  
  DUS 249-4 
Second  Edition  
2018 -mm-dd 
 
 
 Reference number  
DUS 249-4: 2018 y 
© UNBS 2018   
  
Engine Oils — Performance Classification — Part 4: 
Specification for internal combustion engine oils used in four -
stroke -cycle motorcycle gasoline engines and associated drive 
trains  
 DUS 249-4: yyyy  
ii © UNBS yyyy – All rights reserved  
 Compliance with this standard does not, of itself confer immunity fr om legal obligations  
A Uganda Standard does not purport to include all necessary provisions of a contract. Users are 
responsible for its correct application  
© UNBS 2018   
All rights reserved. Unless otherwise specified, no part of this publication may be re produced or utilised in any 
form or by any means, electronic or mechanical, including photocopying and microfilm, without prior written 
permission from UNBS.  
Requests for permission to reproduce this document should be addressed to  
The Executive Director  
Uganda National Bureau of Standards  
P.O. Box 6329  
Kampala  
Uganda  
Tel: +256 41 4 333 2 50/1/2/3  
Fax: +256 41 4 286 123  
E-mail: info@unbs.go.ug  
Web: www.unbs.go.ug  DUS 249-4:yyyy  
© UNBS yyyy – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
US ISO3  Terms and definitions ................................ ................................ ................................ ....................  2 
4 Abbreviated terms  ................................ ................................ ................................ ................................ . 2 
5 Classification  ................................ ................................ ................................ ................................ .........  2 
5.1 Classification according to viscosity  ................................ ................................ ................................ .. 3 
5.2 Classification according to performance ................................ ................................ ............................  3 
6 Requirements  ................................ ................................ ................................ ................................ .........  3 
6.1 General requirements  ................................ ................................ ................................ ...........................  3 
6.1.1  Stability  ................................ ................................ ................................ ................................ ...................  3 
6.1.2  Compatibility  ................................ ................................ ................................ ................................ ..........  3 
6.1.3  Licenses  ................................ ................................ ................................ ................................ .................  3 
6.1.4  Physico -Chemical Requirements  ................................ ................................ ................................ ........  3 
6.2Requirements6.2.1  Performance quality level  ................................ ................................ .........................  4 
6.2.2  Performance Categories  ................................ ................................ ................................ .......................  5 
6.3 Performance grade  requirements  ................................ ................................ ................................ ........  5 
7 Packaging and Labelling  ................................ ................................ ................................ ......................  6 
7.1 Packaging  ................................ ................................ ................................ ................................ ...............  6 
7.2 Labelling  ................................ ................................ ................................ ................................ .................  6 
8 Sampling  ................................ ................................ ................................ ................................ ................  7 
Annex  A (normative)  Physico -chemical requirements  ................................ ................................ ..................  8 
A.1 Physical and chemical property requirements  ................................ ................................ ..................  8 
Annex  B (informative)  Background and examples of assignment of performance classification  ...........  9 
B.1 Background  ................................ ................................ ................................ ................................ ............  9 
B.2 Examples of assignment of performance classification  ................................ ................................ ... 9 
Bibliography  ................................ ................................ ................................ ................................ ......................  11 
 DUS 249-4: yyyy  
iv © UNBS yyyy – All rights reserved  
 Foreword  
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Trade , Industry and 
Cooperatives established under Cap 327 , of the Laws of Uganda , as amended .  UNBS is mandated to co -
ordinate the elaborat ion of standards and is  
(a) a member of International Organisation for Standardisation (ISO) and  
(b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and  
(c) the National Enquiry Point on TBT  Agreement  of the World Trade Organisation  (WTO).  
The work of preparing Uganda Standards is carried out through Technical Committees. A Technical 
Committee is established to deliberate on standards in a given field or area and consists of key stakeholders 
including government, academia, consumer g roups, private sector and other interested parties.  
Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and the 
general public for comments. The committee reviews the comments before recommending the draft stand ards 
for approval and declaration as Uganda Standards by the National Standards Council.  
The committee responsible for this document is Technical Committee UNBS /TC 16, [Petroleum Products and 
Facilities ], Subcommittee SC 1, [Petroleum and Petrochemicals Pr oducts ]. 
This second  edition cancels and replaces the first edition ( US 249:2000 ), which has been technically revised.  
US 249 consists of the following parts, under the general title Engine oil — Performance Classification:   
  Part n: General  
  Part 2 : API Specification for Spark Ignition (petrol) engines  
  Part 3 : API Specification for light and heavy duty Compression ignition (diesel) engines  
  Part 4: Specification for internal combustion engine oils used in four stroke - cycle motorcycle 
gasoline engin es and associated drive trains  
  Part 5: Specification for Internal Combustion engine oils used in two stroke - cycle motorcycle 
gasoline engines and associated drive trains  DUS 249-4:yyyy  
© UNBS yyyy – All rights reserved  v 
 Introduction  
This Draft Uganda Standard aims to specify the minimum performance r equirements for four -stroke engine 
oils used in land - based small engines and to classify their performance according to their frictional properties. 
Land - based small engines is a common industry description intended to separate engines normally used in 
motorcycles, motor scooters, all - terrain vehicles (ATVs) from the generally larger, two - stroke and four - stroke 
engines utilized in passenger cars, light - medium - and heavy - duty trucks and other industrial equipment.  
Unique lubricant performance standar ds have not been in existence for four -stroke engine oils used in 
motorcycles, motor scooters, all -terrain vehicles (ATVs) and related equipment. As a consequence, 
manufacturers of this kind of equipment have experienced field -related problems where four -stroke engine oils 
not meeting the unique frictional requirements of some of these engines have been used. The intent of this 
Draft Uganda Standard is to enable engine manufacturers to better communicate the lubricant needs of their 
engines to consumers and , thus, assist the consumer in selecting the proper lubricant from the many available 
in the marketplace.  
This Standard specifies the performance classification of four -stroke cycle gasoline engine oils based on 
Physico -Chemical Requirements, and three fri ction performance indices, which are derived from the frictional 
properties of the lubricant, according to the JASO T904 (test procedure1).  
 DRAFT UGANDA STANDARD  DUS 249-4: yyyy  
 
© UNBS yyyy – All rights reserved  1 
 Engine Oils  — Performance Classification  — Part 4: 
Specification for Internal Combustion engine oils used in four - 
stroke cycle motorcycle gasoline engines and associated drive 
trains  
1 Scope   
This Draft Uganda Standard specifies performance requirements and test methods for four -stroke cycle spark 
ignition engines employing a common sump containing the lubricating oi l for both the engine and associated 
drive train (transmission, clutch, starter) of motorcycles, motor scooters, all -terrain vehicles (ATVs) and related 
equipment.  
2 Normative references   
The following referenced documents referred to in the text in such a way that some or all of their content 
constitutes requirements of this document. For dated references, only the edition cited applies. For undated 
references, the latest edition of the referenced document (including any amendments) applies.  
US 1732:2017 , Standard Practice for Manual Sampling of Petroleum and Petroleum Products  
US 1733:2017 , Standard Practice for Automatic Sampling of Petroleum and Petroleum Products  
DUS ISO 24254 -2007 Lubricants, industrial oils and related products (class L) -- Family E (internal 
combustion engine oils) -- Specifications for oils for use in four -stroke cycle motorcycle gasoline engines and 
associated drivetrains (categories EMA and EMB)  
DUS 2071 , Standard Test Method for Measuring Viscosity at High Shear Rate and High Tem perature by 
Tapered Bearing Simulator  
DUS 2074 , Standard Test Method for Determination of Yield Stress and Apparent Viscosity of Engine Oils at 
Low Temperature  
DUS 2079 , Standard Test Method for Measuring Viscosity at High Temperature and High Shear rate b y 
Tapered -Plug Viscosimeter  
DUS 2045 , Standard Test Method for Determination of Additive Elements in Lubricating Oils by Inductively 
Coupled Plasma Atomic Emission Spectroscopy  
DUS 2056 , Standard Test Method for Apparent Viscosity of Engine Oils and Base S tocks Between –10 °C and 
–35 °C Using Cold -Cranking Simulator  
DUS 2046  Standard test method for evaporation loss of lubricating oils by Noack Method  
DUS 2053 , Standard Test Method for Determination of Homogeneity and Miscibility in Automotive Engine Oils  
DUS ISO 3104 :1994 , Petroleum products -- Transparent and opaque liquids -- Determination of kinematic 
viscosity and calculation of dynamic viscosity   
2 © UNBS yyyy – All rights reserved  
 DUS ISO 3987 :2010 , Petroleum products — Lubricating oils and additives — Determination of sulfated ash  
DUS ISO 6247, Petroleum products — Determination of foaming characteristics of lubricating oils  
DUS ISO  20844 :2015 , Petroleum and related products — Determination of the shear stability of polymer -
containing oils using a diesel injector nozzle  
US 249 -1:2018  Engine Oil - Performance Classification - Part 1 - General  
US ISO 3 Terms and definitions   
For the purposes of this document, the terms and definitions given in DUS 249 -1 and the following apply.  
3.1 
candidate oil  
four-stroke cycle engine oil whose pe rformance i s subject to DUS 249 -4 
3.2 
reference oil  
four-stroke cycle engine oil of known performance that is used for compar ison to categorize the performance 
of a candidate oil  
3.3 
Friction index  
relative performance index, which is determined by comparing the test  results of the candidate oil with the 
results of the reference oils  
3.4 
Dynamic Friction Index  
DFI 
resultant index determined from the dynamic friction coefficients, d, obtained from the dynamic friction test  
3.5 
Static Friction Index  
SFI 
resultant index  determined from the static friction coefficients, s, obtained from the static friction test  
3.6 
Stop Time Index  
STI 
resultant index determined from the stop time, ST, obtained from the dynamic friction test  
4 Abbreviated terms  
4.1  
EELQMS  
European Engine  Lubricants Quality Management System.  
4.2  
EOLCS  
Engine Oil Lic ensing and Certification System  
5 Classification  
Engine oils shall be classified according to their viscosity and performance as follows  DUS 249-4: yyyy  
© UNBS yyyy – All rights reserved  3 
 5.1 Classification according to viscosity  
Engine oils a re classified to viscosity based on the SAE viscosity classification (SEA J300)  
5.2 Classification according to performance  
Engine oil are classified according to performance based on US ISO  service classification  
6 Requirements  
6.1 General requirements  
The engine oil shall consist of acceptable petroleum products, or of acceptable synthetically prepared 
products, or of a combination of these two types of products, compounded in all cases, with such functional 
additives, for example, detergents, dispersant s, oxidation inhibitors and corrosion inhibitors as are necessary 
to enable it to comply with the other requirements of this standard . 
6.1.1  Stability  
When tested in accordance with DUS 2053 , the engine oil shall remain clear and homogeneous, and shall 
show no evidence of separation of components a nd no evidence of colour change  
6.1.2 Compatibility  
When tested in accordance with DUS 2053 , the engine oil shall be compatible with other oils of the same 
viscosity grade that comply with the requirements of this  standard.  
6.1.3  Licenses  
6.1.3.1 API Categories  
All products licensed under API shall be listed in API EOLCS licensee directory (www.api.org  
6.1.3.2  ACEA Categories  
All products licensed under ACEA shall be justified with a signed EELQMS oil marketers’ Le tter of 
Conformance  
6.1.4  Physico -Chemical Requirements  
6.1.4 1  The oil shall be free from suspended matter,  grit, water or any other foreign matter and impurities.  
6.1.4.2  The oil shall comply with the physico -chemical  and other bench -test requirements a s specified in 
this standard . 
6.1.5  SAE viscosity Grades  
The oils shall conform to one of the SAE mono -viscosity grades or SAE multi -grades in Table A.1, which are 
combinations of W -Grades and other mono -grades, as for example: SAE 10 W and SAE 30 for the SAE 10W -
30 grade. Viscosity limits for each of the mono -grades are also given in Table A.1.  
In case of multi -grades, the prescribed viscosity limits for both the constituent components of the multi -grade, 
shall be met   
4 © UNBS yyyy – All rights reserved  
 a) Table 1 — Engine oil viscosity classif ication  
SAE  
Viscosity  
grade  Low –
temperature  
(oC) Cranking  
Viscosity , cp(1)  
(Max)(a) Low temperature  
(oC) Pumping  
Viscosity , cp  
with no yield 
stress  
(Max)(b) Low-Shear -Rate 
Kinematic  
Viscosity  (mm2/s) 
at 100 OC(c) High -shear -Rate Viscosity  
cP 
at 150 oC  and 106 S(d) 
Min Max 
0 W 6200 at -35 60 000 at -40 3.8   
5 W 6600 at -30 60 000 at -35 3.8   
10 W  7000 at -25 60 000 at -30 4.1   
15 W  7000 at -20 60 000 at -25 5.6   
20 W  9500 at -15 60 000 at -20 5.6   
25 W  13000 at -10 60 000 at -15 9.3   
20   5.6 < 9.3  2.6 
30   9.3 < 12.5  2.9 
40   12.5 < 16.3  2.9 (0W -40, 5W -40 and 10W -
40 grades)  
40   12.5 < 16.3  3.7(15W -40,20W -40, 25W -
40,40 grades)  
50   16.3 < 21.9  3.7 
60   21.9 < 26.1  3.7 
(a test method to be used is DUS 2056  
b test method to be use d is DUS 2044  
C test method to be used is US US ISO  3104:1994  
d test method to be used is DUS 2043 US ISO  
 
6.2Requirements6.2.1  Performance quality level  
Candidate four -stroke cycle engine oils shall be formulated such that their engine performance be of a  quality 
level at least equivalent to one or more of the performance categori es for engine oil sequences given in Table 
2 
Table 2 — Engine oil performance quality level categories  
sequences  Quality Categories  
API a)  SJ, SL, SMc), SNd) 
ILSAC  GF-2, GF -3, GF-4, GF -5 
ACEAb) A1/B1, A3/B3, A3/B4 A5/B5 C2, C3, C4  
a)API performance categories and standards are documented in  DUS 249 -2.  
b) ACEA sequence tests and performance levels are documented in DUS 249 -2 and or the ACEA European oil sequence for service fill 
gasoline engine oils.  
c)Excluding SM/EC  
d)Excluding SN/RC  DUS 249-4: yyyy  
© UNBS yyyy – All rights reserved  5 
  
6.2.2 Performance Categories  
Candidate engine oils shall be formulated such that their engine oil specifications be of a quality level least 
equivalent to one of the performance categories fo r engine oil sequence  given in Table 3 . 
Table 3 — Engine oil performance categories  
Specifications  Performance Categories  
ISO  EMA, EMA1, EMA2, EMB  
JASO  MA, MB  
NOTE:  The consumer shall refer to the owner’s or operator’s manual for recommended category  of engine oil 
to be used in a specific engine  
ISO categories, EMA, EMA1, EMA2 and EMB,  meet the requirements of this standard  
JASO categories, MA and MB, which are equivalent to the ISO oil categories meet requirement of this 
standard  
6.3 Performance grad e requirements  
The performance of four -stroke cycle engine oils shall be classified into one of two grades, as indicated in 
Table 3, based on the three performance indices derived from the friction indices according to the following 
equation:  
The friction index, IF, is calculated in accordance with Equation (1):  
IF = 1+ 
JAFREB JAFREAJAFREB Cand
X XX X
  (1) 
Where   
XCand    is the test result of the candidate oil;  
XJAFREA  is the test result of the reference oil JAFRE -A; 
XJAFREB   is the test result of the reference oil JAFRE -B. 
NOTE  The resultant friction ind ices are calculated such that 2. 00 is obtained when the JAFRE -A oil is evaluated as 
the candidate and 1. 00, when the JAFRE -B oil is evaluated as the candidate.  
Table 3 — Performance classification  
Rated parameter  Performance classification  Test method  
EMA  EMB  
Dynamic Friction Index 
(DFI)  ≥ 1.45 and 2.50 ≥ 0.50 and 1.45  
DUS  ISO 24254 -2007  
Static Friction Index (SFI)  ≥ 1.15 and 2.50 ≥ 0.50 and 1.15 
Stop Time Index (STI)  ≥1.55 and 2.50 ≥ 0.50 and 1.55 
  
6 © UNBS yyyy – All rights reserved  
 Regarding the classification of a candidate oil, if any one or more of th e three friction indices (DFI, SFI and 
STI) does not meet the classification of EMA, the candidate four -stroke cycle engine oil shall be classified as 
EMB.  
Given the wide range in allowable EMA indices, further classification can be made into EMA subcatego ries, 
EMA2 and EMA1, as detailed in Table 4. Subcategories EMA1 and EMA2 may be used only if all the resultant 
friction indices for a candidate oil fall within that specific subcategory.  
Table 4 — EMA Subcategory classification  
Rated parameter  Performance classification  Test method  
EMA  
EMA1  EMA2  
Dynamic Friction Index 
(DFI)  ≥ 1.45 and 1.80 ≥ 1.80 and 2.50  
DUS  ISO 24254 -2007  
Static Friction Index (SFI)  ≥ 1.15 and 1.70 ≥ 1.70 and 2.50 
Stop Time Index (STI)  ≥1.55 and 1.90 ≥ 1.90 and 2.50 
 
7 Packaging and Labelling  
7.1 Packaging  
The condition of the drums or smaller containers and the bulk tankers into which the engine oil is filled shall 
have no detrimental effect on the quality of the engine oil during normal transportation and storag e. Only 
containers of the same size filled with oil of the same batch identification shall be packed together in a carton. 
Prior to use, the containers shall be firmly secured with tamper - proof seal.  
7.2 Labelling  
The following information shall appear i n legible and indelible marking on each container and each carton (if 
used):  
a) product name  and application   
b) US ISO  category or JASO equivalent  
c) the manufacturer's identification and/or distributor’s name;  
d) API and ACEA  Performance quality level  
e) SAE viscos ity grade;  
f) Relevant quality and certification marks  
g) batch identification;  
h) net content (L)  
i) Origin of the product/Made in.  
j) Expiry date " DUS 249-4: yyyy  
© UNBS yyyy – All rights reserved  7 
 8 Sampling  
The relevant sampling procedure given in US 1733:2017  or in US 1732:2017  shall be used to provide samples 
for testing   
8 © UNBS yyyy – All rights reserved  
 Annex  A 
(normative)  
 
Physico -chemical requirements  
A.1 Physical and chemical property requirements  
In addition to prescribed performance requirements, candidate oil shall also satisfy the physical and chemical 
property requirements given in Table  A.1. 
Table A.1 — Physical and chemical property requirements for four -stroke cycle engine oils  
Requirement  Unit Limit  Test method  
Sulphated ash, (max)  % (m/m)  1.2  DUS ISO  3987  
Phosphorous content, (max)  % (m/m)  0.12  DUS 2045  
Evaporation loss, (max)  % (m/m)  20  DUS 2046  
Foaming Tendency Stability  
 
Sequence I, (max)  
Sequence II, (max)  
Sequence III, (max)  ml  
 
10/0 
50/0  
10/0  
 DUS ISO  6247  
Shear stability  
100°C kinematic viscosity 
after test  
XW-30, (min)  
XW-40, (min)  
XW-50 
Other grades  mm2/s  
 
 
9.0  
12.0  
15.0 
Stay in grade  DUS ISO  20844  
Viscosity at high shear rate 
and high temperature 
(150°C), (min)  mPa.s  2.9  DUS 2071  or DUS 2079  
Note  Test shall be conducted by Diesel injector method under standard test conditions  
 DUS 249-4: yyyy  
© UNBS yyyy – All rights reserved  9 
 Annex  B 
(informative)  
 
Background and examples of assignment of performance classification  
B.1 Background  
There are several common performance requirements for the lubrication of motorcycles and automotive 
engines. For many years, the pe rformance requirements of automotive engine oils have been applied to those 
of motorcycles, scooters, ATVs and related equipment without modification. The minimum performance 
requirement for four -stroke engine oils currently recommended by motorcycle and m otor scooter 
manufacturers is defined by the API SJ category.  
However, with the recent trend towards improved fuel economy automotive engine oils (ILSAC GF -5), the 
propensity for misapplication of some of these oils has increased. Unique lubrication deman ds exist for the 
transmission gear, starter and clutch assemblies of motorcycles and motor scooters related to its viscosity and 
frictional characteristics. For low -viscosity engine oils (0W -20), transmission gear durability is known to 
decrease. In additi on, with heavily friction modified engine oils, clutch slippage can result due to the low 
resultant frictional properties of the lubricant, especially at high temperatures where oils of higher frictional 
properties are desired.  
The intention of specifying minimum performance requirements and establishing appropriate limits for 
viscosity, volatility and frictional properties, is to minimize the tendency for misapplication and resulting field 
problems. Four -stroke cycle engine oils, as defined by this Standar d, should be classified according to their 
frictional properties as either EMA (EMA2 and EMA1) (high -friction coefficients) or EMB (low -friction 
coefficients). Note that there are applications, such as with some ATVs, where oils of lower friction are more 
desirable than those with higher friction properties, as defined by the JASO T904 test method. Also, for 
scooters and/or with motorcycles with dry clutches, where clutch slippage is no longer a concern, it can be 
desirable to use oils with lower friction c haracteristics for the derived benefits in fuel economy. Classification of 
interpreted as an indicator of overall perceived quality.  
Furthermore, the phosphorus content of automotive engine oils, such as those meeting API SM has 
decreased to minimize catal yst po  ISOning; acceptable ranges are between a minimum of 0.06 % ( m/m) to a 
maximum of 0.08 % ( m/m). Since current motorcycle design has the transmission lubricated by the engine oil, 
these low -phosphorous oils can lead to an increased propensity for gear  pitting. To minimize these concerns, 
an acceptable range of phosphorous concentrations was incorporated into the specification. Based on gear 
durability tests and field experience, the phosphorous limits were set at a minimum of 0.08 % ( m/m) and a 
maximum  of 0.12 % ( m/m) to ensure a cap to mitigate catalyst po  ISOning concerns.  
B.2 Examples of assignment of performance classification  
Table B.1 provides examples of all possible combinations of friction indices and their relative classification 
assignments. For example, Sample 2 clearly shows all the friction indices, i.e. static friction index (SFI), 
dynamic friction index (DFI) and stop time index (STI), that fall in the EMA classification. Furthermore, it is 
clear that all the friction indices can be furth er classified as meeting subcategory EMA1. As such, either the 
EMA general classification or the EMA1 sub classification may be applied to this sample lubricant. Samples 4 
through 9 provide examples where one or two of the individual indices do not meet ei ther subcategory (EMA1 
or EMA2) as represented by the shading, but clearly fall in the EMA category and are classified accordingly.  
Conversely, Samples 10 through 15 provide examples where one or two of the friction indices fall into the 
EMB range, and, co nsequently, these samples can be classified only as EMB. Subcategories EMA1 and 
EMA2 may be used only if all the resultant friction indices for a candidate oil fall within that specific 
subcategory.   
10 © UNBS yyyy – All rights reserved  
 Table B.1 - Examples of performance classification assignm ent 
Sample  DFI SFI STI EMA  EMA1  EMA2  EMB  
1 ≥ 0.50 and 1.45 ≥ 0.50 and 1.15 ≥ 0.50 and 1.55 - - - X 
2 ≥ 1.45 and 1.80 ≥ 1.15 and 1.70 ≥ 1.55 and 1.90 X X - - 
3 ≥1.80 and 2.50 ≥1.70 and 2.50 ≥1.90 and 2.50 X - X - 
4 ≥ 1.45 and 1.80 ≥ 1.70 and 2.50 ≥ 1.90 and 2.50 X - - - 
5 ≥ 1.80 and 2.50 ≥ 1.15 and 1.70 ≥ 1.90 and 2.50 X - - - 
6 ≥1.80 and 2.50 ≥1.70 and 2.50 ≥1.55 and 1.90 X - - - 
7 ≥ 1.45 and 1.80 ≥ 1.15 and 1.70 ≥ 1.90 and 2.50 X - - - 
8 ≥ 1.80 and 2.50 ≥ 1.15 and 1.70 ≥ 1.55 and 1.90 X - - - 
9 ≥1.45 and 1.80 ≥1.70 and 2.50 ≥1.55 and 1.90 X - - - 
10 ≥ 0.50 and 1.45 ≥ 1.15 and 2.50 ≥ 1.55 and 2.50 - - - X 
11 ≥ 1.45 and 2.50 ≥ 0.50 and 1.15 ≥ 1.55 and 2.50 - - - X 
12 ≥1.45 and 2.50 ≥1.15 and 2.50 ≥0.50 and 1.55 - - - X 
13 ≥ 0.50 and 1.45 ≥ 0.50 and 1.15 ≥ 1.55 and 2.50 - - - X 
14 ≥ 1.45 and 2.50 ≥ 0.50 and 1.15 ≥ 1.50 and 1.55 - - - X 
15 ≥0.50 and 1.45 ≥1.15 and 2.50 ≥0.50 and 1.55 - - - X 
 DUS 249-4: yyyy  
© UNBS yyyy – All rights reserved  11 
 Bibliography  
[1] ASTM D4485, Standard Specification for performance of Engine Oils  
[2] JASO T 903, Motorcycles―four -Stroke Cycle Gasoline Engine Oils  
[3] JASO T904, Motorcycles — Four Stroke Cycle Gasoline Engine Oils — Friction Properties Test for the 
Clutch Systems  
[4] ISO24254:2007 Lubricants, industrial oils and related products (class L) - Family E (Internal 
combustion engine oils) - specifications for use in four -stroke cycle motorcycle gasoline engines and 
associated drevetrains (categories EMA and EMB)  
 DUS 249-4: yyyy  
© UNBS yyyy – All rights reserved  13 
 Certificat ion marking  
Products that conform to Uganda standards may be marked with Uganda National Bureau of Standards 
(UNBS) Certification Mark shown in the figure below.  
The use of the UNBS Certification Mark is governed by the Standards Act, and the Regulations made 
thereunder. This mark can be used only by those licensed under the certification mark scheme operated by 
the Uganda National Bureau of Standards and in conjunction with the relevant Uganda Standard. The 
presence of this mark on a product or in relatio n to a product is an assurance that the goods comply with the 
requirements of that standard under a system of supervision, control and testing in accordance with the 
certification mark scheme of the Uganda National Bureau of Standards. UNBS marked products  are 
continually checked by UNBS for conformity to that standard.  
Further particulars of the terms and conditions of licensing may be obtained from the Director, Uganda 
National Bureau of Standards.  
 
 DUS 249-4: yyyy    
 
ICS nn.nnn.nn  
Price based on nn pages  
© UNBS yyyy– All rights reserved