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, doesn't seem to have a lot of FMs that would affect the clutch, and would help clean out the previous oil (unknown oil, unknown time between changes -- he bought it used and the old oil looked pretty nasty).
The bike has ~28,000 miles on it.