If you read the specs on most of the fluids like Hy Guard and Cat they have "frictional modifiers" in them which you don't want. They use them to keep the clutch's from chattering (makes them slip). For lower hp applications they are fine. But they will generate more heat. The Red Line lite is excellent and so is "Mike's Trans Fluid" which he blends. I have gone back to Mike's Trans Fluid this year and prefer it over anything else I've run.