JASO is a part of the Society of Automotive Engineers of Japan (財団法人自動車技術会, Zaidan-hōjin Jidōsha Gijutsukai, JSAE).
It stipulates the lubricating oil requirements for 2-stroke gasoline engines, such as those used in motorcycles, general-purpose machines, and outboard motors,[1] and was established in 1994.
[2] For 2-stroke oil, lubricity, cleanliness, exhaust smoke, and exhaust system blockage are evaluated using the test methods specified in JASO M 340, M 341, M 342, and M 343, resulting in the grades FB, FC, and FD.
The performance classifications are as follows: Additionally, FB, FC, and FD are adopted as EGB, EGC, and EGD, respectively, in ISO standards.
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