Not to start a keyboard war but I’m curious as to what viscosity everyone runs in their race car and why. I’ve been involved in some discussions related to rpm, engine water temp, fuel preferences, 1/8 mile vs 1/4 mile, cold starts, outside air temp and so on. The discussion started relating to cold starts and how hard it may be on the engine with a 20/50 oil and oil system components, also gas vs alcohol related to water temp, and of course the hp differences related to viscosity…what say the masses…