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More power - masterjim
Recommended by Reviewer: Yes
Pros: smoother shifting, cooler running, increased acceleration
Cons: limited viscosities available
AKA Castrol Power 1 outside the U.S.. RS stands for reduced slippage. Full synthetic formula runs up to 8 degrees cooler than the part synthetic Castrol Actevo in a friend's ZX6R 636. Improves performance in any bike like my ZX9R. This oil has been recommended by BMW for years and used as a baseline oil for many European road tests. A big boost in power when the engine gets really hot, where conventional oils start to lose power. Engine revs more freely at higher rpm's where conventional oils struggle. JASO MA2 rating means extra grip for the clutch. In the past, synthetics have caused clutch slippage as do car oils today. This is no longer the case. Excellent oil for the street or track.