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It stipulates the lubricating oil requirements for 2-stroke gasoline engines, such as those used in motorcycles, general-purpose machines, and outboard motors, and was established in 1994. For 2-stroke oil, lubricity, cleanliness, exhaust smoke, and exhaust system blockage are evaluated using the
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test methods specified in JASO M 340, M 341, M 342, and M 343, resulting in the grades FB, FC, and FD. FA has been abolished. The performance classifications are as follows:
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FC: Low smoke with excellent performance in reducing exhaust smoke and system blockage compared to FB.
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Additionally, FB, FC, and FD are adopted as EGB, EGC, and EGD, respectively, in
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FD: Enhanced cleaning performance at high engine temperatures compared to FC.
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FB: Superior lubricity and cleanliness compared to FA.
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