if these additives work, don't yo think mobil or other companies would add it to their oil and sell it as well.... these aditives have come and gone for well over 30 years... always with the claim "the oil compnaies SUPPRESS our product"Not sure I understand 'legit' companies reference, but can either of you provide more infromation than 'it will have a negative effect on the clutch', seems like that is what they said about synthetic oil also.
jhellstr - I agree that you did an excellent job summarizing the issue. You should write service manuals and owners manuals. Maybe then they would make sense......Friction modifiers are great for a conventional engine, but mostmotorcycles (Harley excluded) have the clutch comprised of multiple friction plates and metal plates that are in the engine crankcase and as a result are bathed in the engine oil. When subjected to oils that contain a friction modifier it can make the clutch plates so slick that they will tend to slip. That is the short version of the problem. Harley Davidson engines have aseparate transmission and the clutches are not in the engine crankcase.
Jeff...
A scholar and a gentleman,thank you.Friction modifiers are great for a conventional engine, but mostmotorcycles (Harley excluded) have the clutch comprised of multiple friction plates and metal plates that are in the engine crankcase and as a result are bathed in the engine oil. When subjected to oils that contain a friction modifier it can make the clutch plates so slick that they will tend to slip. That is the short version of the problem. Harley Davidson engines have aseparate transmission and the clutches are not in the engine crankcase.
Jeff...