Originally Posted By: Gunatics_Adler Plus passenger car oils seem to shear badly in shared sump systems. Perhaps a high mileage 20w50, but still you would be better running a good
diesel oil. How well do the high-mileage passenger car oils hold up in motorcycles? My friend has an 1100cc Kawasaki Ninja that we put M1 High Mileage 10W-40 into, as it's available for cheap at Wal-Mart, ...