Quote Originally Posted by DanGTP View Post
Mine spins at almost 15,000 RPM at 6,000 RPM on the motor. A differential has much larger gears and rotating pieces, but I don't think it spins quite that fast. Maybe 8,000 RPM max? Based on that, I don't think 75W-90 gear oil would be appropriate for the SC gears. Something like a very good, low weight synthetic may work, but I'd be looking for something that has a low thermal expansion. The turbine oil sounds like a pretty good idea, though!
That's why I want to try the 10w 30 mobile 1.