This myth has been debunked a number of times, most recently in a two issue test done by Motorcycle magazine two years ago.
High qaulity Synthetic Auto oil is actually superior to many so called MC oils out there.
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Originally Posted by my89_928gt
You should never use car oil in a motor cycle. It normaly dose not have the EP(extream pressure addative) or enoguh of it prehaps. Resone is the transmission and the wet clutch used in the Jap bikes need it. The clutch will slip and require replaceing early.
Grant it I have not had a back in nearly 10 years.
Double check, but I'm sure it is still the case.
Richard
97 Boxster 5sp black 92,000 miles
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