when i used to have a honda cbr 600 and a honda nighthawk i actually ran automotive oils in both bikes. at that time i was running Mobil1 10w30. both bikes were inline 4 bangers. I never had a clutch slipped on either. oh btw i also run mobil1 10w30 in my 1996 honda 300EX atv. Samething no clutch issues in the 5-6 years i had that atv. i think it depends on the bike. My cbr was a very hp driven motorcycle and it never spun the clutch ones using the oil i mentioned. So basically. if you want to be safe follow what your owners booklet says.
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