In the November issue of Dirt Rider, there is an article by Ron Hinson on clutch inspection. Hinson says that petroleum oil is better than synthetic oil for the clutch. He says that on an engine where the same oil bathes the clutch and the top end one should use high quality pure petroleum oil and change it often. He says that in such an engine the oil will become contaminated from the clutch long before it degenerates so that the long-lasting benefits of synthetic oils are wasted. Does anyone have any comments?