Thinking about making life easier and just buy synthetic oil in bulk for the FooBarr Fleet of vehicles. I tried synthetic in my XR 628 and the clutch lasted about 2 days. Of course it was an old clutch and the oil probably just pushed it over the edge along with swingin a 10 lug sand-paddle. Then again I'm awaiting the new auto clutch, maybe sythetic would work with it? More RPM, more HP, more pressure on the plates, right?