Ive heard all this stuff about not using anything with a "friction modifier" (which by definition means a "lubricant" and I know its common belief, but I do not believe it, and I ignore it. Oil is a lubricant. Thats what its in there for. Its supposed to be slippery, and its supposed to make your clutch slip, when you pull that lever. Almost every oil out there claims to be "energy conserving" now. I run anything of the appropriate weight, 10w40, or 10w30. Ive been waiting years for all that clutch slipping stuff to happen, and Im out of patience. It started slipping when it was worn out, about 3 years ago. One clutch replacement over 15 years, using everything from Dollar General oil to Mobile 1 Synthetic or whatever was around is acceptable wear and performance for me. If you consider that too risky, Id never discourage anyone from buying the expensive stuff. Id have no qulams about dumping that bottle of "energy conserving" oil in my gearbox.

When people talk about using 80 or 85 weight oil, they are talking about motorcycle shop two stroke gearbox oils, which are somehow rated differently. All you have to do is pour one. They pour like a 10w30. If you go to Autozone and buy Valvoline 85W general purpose gear oil, your clutch will not disengage when you pull it until your engine gets very, very hot.