I used to run 5-50 synthetic, Mobile 1, Castrol, etc. Been using Brad Penn semi synthetic 10-30 after break in, the last couple of years. I also run a 3 quart accumulator, .003 rods, .0035 mains, with no issues from oil. I like it. I'm at 80+#'s through the lights at 8000 RPM, oil temp at 140-160. I couldn't care less about water temp at the starting line unless it's overheating. I also have a pan heater and won't make a pass until oil temp is 120. BTW viscosity is measured in centapoise@70 degrees F(cps), not weight. It doesn't matter to me what you want to call it, but that is right.