Two-Stroke Oil Ratings

Even today, there continues to be a huge number of questions regarding which oil is the one to use, which oil is better than another, and which oil is good enough. Let’s review the two-stroke lubricant standards; API TC; TCW; TC-W2; TC-W3; JASO FC; and ISO-L-EGD.
Non-racing two-stroke oils are usually given ratings from the API (American Petroleum Institute) “TC”, the BIA (Boating Industry Association) “TC-W” and currently the NMMA (National Marine Manufacturers Association) “TC-W2 and TC-W3”. The TC, TC-W and TCW2 standards are not current and do not meet the standards of today’s performance engines.

For a lubricant to receive one of these ratings it must pass certain levels of cleanliness and film strength. The lubricant is run at ratios up to 150:1 for specified times and loads. The engine is then examined for carbon deposits and for bearing and cylinder wear. If it meets the test criteria, the lubricant passes.

The Japanese Automobile Manufacturers Organization (JASO) developed a series of tests aimed at presenting more real-world conditions that a lubricant used in a motorcycle, snowmobile, ATV or PWC would encounter in use by consumers. They test for exhaust valve cleanliness, lubricity, exhaust smoke/blocking and initial torque. The highest JASO standard is FC. These tests are very difficult to pass and are a better indicator of a lubricants level of protection and performance that TC-W3 in non-marine applications.

European engine manufacturers tested TC-W3 and JASO lubricants and determined that their engines needed a cleaner lubricant and one that would withstand higher heat conditions. They established the ISO international standards for two stroke engine lubricants. Their first standard, ISO-L-EGB was comparable to the JASO FB standard. They later developed the ISO-L-EGC which is similar to the JASO FC rating.

They felt they needed an even tougher standard for the newest generation of performance two stroke engines. The ISO-L-EGD+ was created to establish a higher standard of detergency and ability to withstand higher levels of heat. The new test runs for 3 hours vs 1 hour for the previous test.

If a lubricant is certified ISO-L-EGD+ it has passed the most stringent tests set by American, Japanese and European engine manufacturers. Polaris recommends TC-W3 lubricants, Yamaha JASO FC and Ski-Doo/Sea-Doo requires ISO-L-EDG+ lubricants.

Examine the oil bottle of any oil in question and see what the highest level of certification is. It is generally accepted that if you use a lubricant that meets the ISO-L-EGD+ standard in your new snowmobile you will provide certified warranty compliance and protection.

 
 

3 thoughts on “Two-Stroke Oil Ratings

  1. We were told by Amsoil in an e-mail from Amsoil, that there is NO “ISO-L-EGD+” rating they said the (+)it is a lie and doesn’t exist, and is a advertising gimmic. Amsoil also stated NO SkiDoo/SeaDoo requires such a rating. If this is true, then will you be retracting the arcticle in your magazine, or if the (+) rating is real, will you please contact Amsoil so they will quit telling customers that there is NO ISO-L-EGD+ rating.
    Thank You,
    Don Friedrich / Performance Parts

  2. If you take a look at the newer article: http://snowtechmagazine.com/?p=399 you will see that there is no ISO designation of ISO-L-EGD+ there is no ISO-EGD+ either. Google would also demonstrate that fact. Klotz has put that on the labels of some of their oil, but it is not a standard whatsoever. AMSOIL was correct.

    Also Ski-Doo does not state anywhere in writing that they REQUIRE ISO-L-EGD+ or ISO-EGD+

    In writing they only recommend their oil, same as the other manufacturers.
    They do say:
    QUOTE: Do not use NMMA TC-W, TC-W2 or TC-W3 outboard two-stroke engine oils or ashless two-stroke engine oils ENDQUOTE (from 2009 MXZ 600HO E-TEC operators guide, page 55 Recommended Injection Oil)

  3. this rateing thing is so confuseing that i just use this simple way to get the best 2cycle oil if the the oil is used with good results for an engine that has high rpm and high compression and is also clean burning and for air cooled as mine is then it must be one of the best ones for all simular air cooled engines so that if it could stand up the the most stress and abuse like raceing and kart raceing its got to be good not to say that a landscaper who uses engines everyday should use such an high grade costly oil when he has to be concerned a lot with cost of oil where as i as sports user on weekends raceing rideing hard ect will gladely pay more money for the the oil for the most protection for my machine even more so when parts are not available too costly and hard to get so me as not an expert must use this simple way would any agree

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