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Old 07-21-2012, 09:05 AM   #1
suzukisoul
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Default Engine Oil Type for 00 Suzuki GSX750F

Ok so I saw somewhere that I'm not supposed to use a motorcycle oil with API SJ/SL/SM ratings, that I am supposed to go with SF/SG. But I could not find a straight answer anywhere online, thus leading me here. I have Castrol 10w-40 Power RS Racing 4T. Its API is SL/JASO MA-2. I have not put it in cause I am still sketched about the post I saw about not using SL/SJ/SM. Can anyone tell me if it's safe to use the oil I have or why I cannot use SL/SJ/SM API rated oils?

Thanks again.

to look up the post, go to google, type in '10 basic katana upgrades', its the first link. on that page its the third upgrade.
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Old 07-21-2012, 09:36 AM   #2
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The JASO MA-2 rating means it's safe to use with a wet clutch.

My guess is that at the time the motorcycle was built, SF/SG was the latest standard for oil. SL/SJ/SM are simply later standards and are backwards-compatible to the older guidelines.

Whoever said you couldn't use later standards than when the motorcycle was built has got their information wrong. The only real way to avoid that is to stock up on a lifetime supply of oil when the motorcycle is new.
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Old 07-21-2012, 10:42 AM   #3
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API doesn't have a motorcycle rating, only JASO does. As long as the oil isn't the energy-conserving kind, which will interfere with your clutch, you can use it. There can be some differences between oils for auto engines and those rated for motorcycles, mostly because auto oils don't have to tolerate transmission gear forces. Oils meant for Diesel engines do see those forces, which is why Rotella T6 now has a JASO rating for motorcycles. Whether those forces create significant changes over the time your oil is in the engine is up for debate.
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Old 07-23-2012, 04:36 PM   #4
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thanks for the replies. I confirmed through some research that SF/SG are now obsolete ratings, that the additives can only effect the clutch slipping, and as long as it says motorcycle oil, Im good. thanks again
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