DRAFT UGANDA STANDARD  
  DUS 249 -5 
Second  Edition  
2018 -mm-dd 
 
 
 Referenc e number  
DUS 249 -5: 2018 
© UNBS 2018   
  
Engine Oils   — Performance Classification   — Part 5: 
Specification for Internal Combustion engine oils used in two - 
stroke cycle motorcycle gasoline engines and associated drive 
trains  
 DUS 249-5: 2018  
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  
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The Executive Director  
Uganda National Bureau of Standards  
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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 -5:yyyy  
© UNBS yyyy  – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 Abbreviated terms  ................................ ................................ ................................ ................................ . 2 
5 Requirements  ................................ ................................ ................................ ................................ .........  2 
5.1 General requirements  ................................ ................................ ................................ ...........................  2 
5.1.3  Physico -Chemical Requirements  ................................ ................................ ................................ ........  2 
5.2 General Perfor mance requirements  ................................ ................................ ................................ .... 2 
5.3 Physical and chemical property requirements  ................................ ................................ ..................  3 
6  Packaging and Labelling  ................................ ................................ ................................ ......................  3 
6.1 Packaging  ................................ ................................ ................................ ................................ ...............  3 
7.2 Labelling  ................................ ................................ ................................ ................................ .................  3 
Annex  A (normative) Performance requirements in the laborato ry test  ................................ ......................  5 
ANNEX B  (informative)   Current and Obsolete engine oil Categories for 2 stroke cycle 
motorcycle gasoline engine applications  ................................ ................................ ...........................  7 
Bibliography  ................................ ................................ ................................ ................................ ......................  10 
 DUS 249-5: 2018  
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 ma ndated to co -
ordinate the elaboration 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  Agreeme nt 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 
includin g government, academia, consumer groups, 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 b efore recommending the draft standards 
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 Products ]. 
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 classificatio n:  
• ⎯ Part 1 : General   
• ⎯ Part 2 : Specification for Spark Ignition (petrol) engines  
• ⎯ Part 3 : Specification for light and heavy duty Compression  ignition  (diesel) engines  
• ⎯ Part 4: Specification for internal combu stion engine oils used in four stroke -cycle motorcycle 
gasoline engines and associated drive trains  
• ⎯ Part 5: Specification for Internal Com bustion engine oils used in two stroke cycle motorcycle 
gasoline engines and associated drive trains  DUS 249 -5:yyyy  
© UNBS yyyy  – All rights reserved  v 
 Introduction  
Due to the technological advances that hav e occurred since the publishment of US 249:2000/ EAS 159, it has 
become necessary to keep abreast with such changes, hence the revision of this standard.  
It has become necessary to sub -divide this standard into five  parts.  
DUS 249 -1:2017, Engine Oil — Performance Classifications — Part 1: General,  
DUS 249 -2:2017, Engine Oils — Performance Classifications — Part 2: API Specification for Spark Ignition 
(petrol) Engines  
DUS 249 -3: 2017, Engine Oil — Performance Classification — Part 3: API Specification for light and heavy 
duty compression Ignition (diesel) engines  
DUS 249 - 4: 2017, Engine Oil — Performance Classification — Part 4: Specification for internal combustion 
engine oils used in four - stroke cycle motorcycle gasoline engines and associated drive tra ins 
DUS 249 -5: 2017 Engine Oils — Performance Classification — Part 5: Specification for Internal Combustion 
engine oils used in two - stroke cycle motorcycle gasoline engines and associated drive trains  
This standard outlines the performance classificatio ns as applicable to API, JASO and ISO  Oil sequences  
 DRAFT UGANDA STANDARD  DUS249 -4:yyyy  
 
© UNBS yyyy – All rights reserved  1 
 Engine Oils  — Performance Classification  — Part 5: 
Specification for Internal Comb ustion engine oils used in two 
stroke  - cycle motorcycle gasoline engines and associated 
drive trains  
1 Scope  
This Draft  Uganda standard specifies requirements and test methods for motorcycle engine oils  for two-stroke 
cycle spark ignition gasoline engines  that employ a crankcase scavenging system and are  used in 
transportation and leisure applications  
This Standard specifi es the performance classification of two -stroke cycle gasoline engine oils based on the 
API classification, JASO and ISO classifications  
2 Normative references   
The following referenced documents referred to in the text in such a way that some or all of t heir 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 ISO 2719 , Determination of flash poin t -- Pensky -Martens closed cup method  
DUS ISO 3104 , Petroleum products -- Transparent and opaque liquids -- Determination of kinematic viscosity 
and calculation of dynamic viscosity  
DUS ISO 3987 , Petroleum products — Lubricating oils and additives — Determ ination of sulfated ash  
DUS ISO 13738 -2011  Lubricants, industrial oils and related products (class L) -- Family E (Internal 
combustion engine oils) -- Specifications for two -stroke -cycle gasoline engine oils (categories EGB, EGC and 
EGD)  
DUS 2053 , Standard  test method for the determination of homogeneity and miscibility in automotive engine 
oils 
US 249 -1, Engine Oil - Performance Classification - Part 1 - General  
 
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  
Two-stroke cycle engine oil whose performance is subject to DUS 249 -5:2018   
2 © UNBS yyyy – All rights reserved  
 3.2 
Reference oil  
Two-stroke cycle engine oil of known performance that is used for comparison to categorize the performance 
of the candidate oil.  
4 Abbreviated terms  
For the purposes of this standard, the following abbreviations in DUS 249 - 1:2018  and the following apply:  
4.1  
JASO  
Japanese Automobile Standards Organization . 
5 Requirements  
5.1 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, dispersants, oxidation i nhibitors and corrosion inhibitors as are necessary 
to enable it to comply with the other requirements of this standard . 
5.1.1 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 and no evidence of colour change.  
5.1.2 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.  
5.1.3 Physico -Chemical Requirements  
5.1.3.1 The oil shall be free from suspended matter, grit, water or any other foreign matter and impurities.  
5.1.3.2 The oil shall comply with the physico -chemical and other bench -test requirements as specified in 
this sta ndard  
 5.2 General Performance requirements  
Candidate two -stroke cycle engine oils shall be formulated such that their engine performance  requirements 
be of one of the performance categories for engine oil specifications given in Table 1 . 
Table 1 — Engine oil performance categories  
Specifications  Categories  
API   TC 
ISO EGB, EGC, EGD  
JASO  FB, FC, FD  
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  DUS 249 -5: yyyy  
© UNBS yyyy – All rights reserved  3 
 5.2.1 Current ob solete categories are TA TB and TD under the API classification and FA under JASO 
classification  
5.2.2 Lubricants labelled or used in two - stroke cycle motorcycle gasoline  engines  must have a 
performance not lower than that defined by API TC, ISO EGB and J ASO FB  
5.3 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 2 and Table 3. These physical and chemical properties  have been 
selected to minimize internal leakage in oil injection pumps and reduce the tendency toward pre -ignition due 
to ash -derived combustion chamber deposits.  
Table 2 — Physical and chemical property requirements for ISO category  
Requirement  Limit  Method 
Kinematic viscosity at 100 °C, mm2/s  ≥ 6.5 DUS ISO 3104  
Sulfated ash  mass %  ≤ 0.18 DUS ISO 3987  
Table 3 — physic -chemical properties required for JASO  and API  category  
Item Performance classification  applied  Limit  Test method  
Kinematic Viscosity,  (min) FB, FC /TC,FD 6.5  DUS ISO 3104  
Flash point OC, (min) FB, FC /TC,FD 70  US ISO 2719  
Sulfated Ash mass %, 
(max) FD 0.25  DUS ISO 3987  
0.18  
6  Packaging and Labelling   
6.1 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 storage. Only 
containers of the same size filled with oil of the same batch identification shall  be packed togeth er in a carton.  
Prior to use, the containers shall be f irmly secured with tamper - proof seal .  
6.2 Labelling  
The following information shall appear in legible and indelible marking on each container and each carton (if 
used):  
a) product name and application  
b) Category of engine oil the manufacturer's identification and/or distributor’s name;  
c) SAE viscosity grade  
d) Relevant quality and certification marks  
e) batch identification  
f) net content (L)   
4 © UNBS yyyy – All rights reserved  
 g) Origin of the product/Made in.  
h) Expiry date  DUS 249 -5: yyyy  
© UNBS yyyy – All rights reserved  5 
 Annex  A 
(normative)  
Performanc e requirements in the laboratory test  
A.1 ISO category  
The ISO performance requirements  of two -stroke  engine oils shall be  classified into three grades, as indicated 
in Table A.1, based on the six performance indices derived from four engine tests. The gra des are EGB, EGC 
and EGD, from lower to higher performance. A standard reference oil, designated JATRE -1, shall be used in 
all test methods and its performance establishes the standard index of 100.  
Regarding the classification of candidate oil, each perfo rmance index of the candidate oil shall meet the 
standard index given in Table A.1, candidate oil shall be classified according to the lowest category to which 
any one of the six candidate performance indices corresponds.  
In the case of multiple engine tes ts being used to assess a candidate oils performance, a statistically based 
methodology should be used. For two tests, the mean of the candidate performance indices shall be equal to 
or exceed the standard index. For three or more tests, one test shall be discarded, and the mean of the 
remaining performance indices shall be equal to or exceed the standard index.  
Table A.1 — Performance requirements according to ISO category  
Performance 
parameter  Minimum performance requirement(a) Test procedure  
EGB  EGC  EGD 
Lubricity  95 95 95  
 
 
 
DUS ISO 13738 -
2011  Initial torque  98 98 98 
Detergency  85 95 _ 
_ _ 125 
Piston skirt deposits  85 90 _ 
_ _ 95 
Exhaust smoke  45 85 85 
Exhaust system  
Blocking  45 90 90 
(a) Each number represents an index, taking JATR E-1 as 100 . 
 
A.2 JASO category  
The JASO performance level of 2 stroke oils is classified into three grades, FB, FC, and FD, according to the 
test result based on the mentioned test method in table A.2  
The FC grade is defined for low smoke 2 cycle oils sup erior to FB with regard to exhaust smoke and exhaust 
system blocking. FD grade is defined as improved version of FC in terms of detergent performance at high 
temperature  
NOTE FA grade was abolished in order to maintain consistence with ISO classification.   
6 © UNBS yyyy – All rights reserved  
 The evaluation items for the JASO test procedures and standard indices for each performance classification 
are shown in table A 2  
Table A.2 — Performance requirements according to JASO category  
Evaluation item  Standard index (min)  Test procedure  
FB FC/TC(1) FD 
Lubricity  95 95 95  
 
 
 
 
   DUS ISO 13738 -2011  Initial Torque  98 98 98 
Detergency  Evaluation 
after 60 , 
(min) Fundamental 
part 85 95 - 
Piston Skirt 
Part - - - 
Evaluation 
after 180 , 
(min) Fundamental 
part - - 125 
Piston Skirt 
Part - - 95 
Exhaust Smoke  45 85 85 
Exhaust system Blocking  45 90 90 
(1)API category TC has equivalent Performance specifications to JASO category FC  
 
 
 
 DUS 249 -5: yyyy  
© UNBS yyyy – All rights reserved  7 
 ANNEX B  
(informative )  
 
Current and Obsolete engine oil Categories for 2 stroke cycle motorcycle 
gasolin e engine applications  
B.1 JASO Specifications  
Table B.1 — showi ng current JASO categories for two  stroke cycle motorcycle Engine Oil  
Category  status  Service  
 FA 
 abolished  Original spec established regulating 
lubricity, detergency, initial torque, 
exhaust  smoke and exhaust system 
blocking  
 FB 
 Current  Increased lubricity, detergency, 
exhaust smoke and exhaust system 
blocking requirements over FA.  
 FC 
 Current  Lubricity and initial torque 
requirements same as FB, however 
far higher detergency, exhaust 
smoke and exhaust system blocking 
requirements over FB.  
 FD 
 current  Same as FC with far higher 
detergency requirement.  
 
B.2 ISO Specifications  
The performance of two -stroke cycle motorcycle engine oils is classified into three grades, as indicated in 
Table  B.2, based on the six performance indices derived from four engine tests from lower to higher 
performance  
Table B.2 — showing current and ISO categories for 2 stroke Spark Ignition application Engine Oil  
Category  status  service  
ISO-L-EGB  
 Current  Same re quirements as JASO FB + 
test for piston cleanliness  
ISO-L-EGC  
 Current  Same requirements as JASO FC + 
test for piston cleanliness.  
ISO-L-EGD  
 Current  Same requirements as JASO FD + 
test for piston cleanliness + 
detergent effect.  
  
8 © UNBS yyyy – All rights reserved  
 B.3 API Specifications  
For 2 stroke motorcycle gasoline engine oil, the latest API service category includes performance properties of 
each earlier category and can be used to service older engines where earlier category oils are recommended  
Table B.3 — showing current and obsol ete API categories for 2 stroke Spark Ignition application 
Engine Oil  
Spec  Status  Description  
TA Obsolete  Proposed classification for two -stroke engine oils required for extremely -small engines, typically less 
than 50 cc. Engine Tests for this classificat ion were under preparation when the Coordinating 
European Council (CEC) withdrew support for this category.  
TB Obsolete  Proposed classification for two -stroke engine oils required for the engines of motor -scooters and other 
highly -loaded small engines, ty pically between 50 and 200 cc. The test sponsor no longer requires this 
category, and the classification has been abandoned.  
TC Current  Designed for various high -performance engines, typically between 200 and 500 cc, such as those on 
motorcycles and snowm obiles, and chain saws with high fuel -oil ratios - but not outboards. Two -cycle 
engine oils designed for API Classification TC address ring -sticking, pre -ignition and cylinder scuffing 
problems.  
TD Obsolete  Designed for water -cooled outboard engines, thi s classification used the identical engine test to that in 
the National Marine Manufacturers association (NMMA) TC -W category. API TD has been 
superseded, and is no longer accepted by the NMMA, who now recommend oils meeting the 
requirements of TC -W3 for w ater-cooled outboard engines.  DUS 249 -5: yyyy  
© UNBS yyyy – All rights reserved  9 
 Annex  C 
(informative)  
 
Supplementary information on the purpose and use of this International 
Standard  
C.1 General  
This Standard, specifies the performance classification of t wo-stroke cycle motorcycle gasoline engine oils, 
based on physical and chemical properties, and performance indices which are derived from six important 
performance parameters: l ubricity, initial torque, detergency , piston skirt deposits, exhaust smoke and  exhaust 
system blocking. This Standard is based upon the test procedures and specifications developed by the 
Japanese Automobile Standards Organization (JASO) of the Japanese Society of Automotive Engineers 
(JSAE).  
JASO was joined in this effort by the Am erican Society for Testing and Materials (ASTM) and the Coordinating 
European Council for the development of performance tests for fuels, lubricants and other fluids (CEC). The 
CEC L -079-A-99 test method was developed by CEC L -058 with the assistance of JA SO. Subsequently, 
JASO expanded their performance classification system to include a new category, JASO FD. A similar test 
procedure to the CEC L -079-A-99 detergency test procedure was developed. Equivalency between data 
obtained using either of these two test procedures has been established and either test may be used to 
develop data for use in ISO -L-EGD or JASO FD. At the same time that JASO added the category FD, they 
also deleted the category FA. The ISO and JASO performance classification systems for t wo-stroke cycle 
engine oils are now harmonized.   
10 © UNBS yyyy – All rights reserved  
 Bibliography  
[1] JASO M340, Two -stroke -cycle gasoline engine - engine  oils - lubricity test  
[2] JASO M341  Two-stroke -cycle gasoline engine - Engine oils - Detergency test  
[3] JASO M3 42, Two -stroke cycle gas oline engine - Engine oils -Smoke test  
[4] JASO M343 , Two -stroke -cycle gasoline engine - engine oils - Exhaust blocking system test  
[5]  JIS K 2283 , Crude Petroleum and Petroleum Products - Determination of Kinematic Viscosity and 
Calculation of Viscosity Index from  Kinematic Viscosity   
 US 249-5: yyyy  
© UNBS yyyy – All rights reserved  11 
 Certification 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 relation to a product is an assurance that the goods comply with the 
requi rements 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 249-5: yyyy    
 
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