I would like to know if any of you out there know where there is something written about which oils are compatible with or equivelent to Honda's GN-4. I have read that some of you are using many different brands and weights and are having good results. I have heard that there are additives in Honda's oil that are designed for the wet clutch systems and using the wrong oil may cause the clutch to slip. I like to have facts and data to base my decisions on. Any help will be greatly appreciated. Thanks