If it contains the same friction modifiers that some automotive oils have, I doubt the fiber plates can be saved if the clutch has begun to slip in higher gears.
In the only comparison test I'm aware of, motorcycle specific oils didn't perform as well as automotive oils. More money, less performance, but big bucks for the seller.I just use 10W/40, but I really think that actual motorcycle oil may perform slightly better.
All XXW-30 automotive oils in North America contain friction modifiers. As mentioned above, currently, 10W-40 and 15W-40 automotive oils do not. All motorcycle specific oils are safe in wet clutches and do not contain friction modifiers, but they typically cost 3-4X as much as the 40 weight oils.But I thought I got into this whole mess because regular oil has friction modifiers?
Forum member Buickguy put over 100,000 miles on his '87 CMX250 using Castrol, and never had an engine issue, including the clutch.Castrol 10W-40 and Shell Rotella 15W-40 are the oils most forum members use. Those oils have been widely used for years with no problems.