Quote Originally Posted by GAWnCA View Post
I know one thing, this 20w50 is almost the same thing as running straight STP. So I'm going to try some 10w30 synthetic and see how that works out. My oil is at 80 psi with the 20-50.
The synthetics are not nearly as thick cold.

My 20-50 syn is likely thinner than 10w-40 dyno cold.

My hot idle pressure is 23PSI

My cold or hot running (WFO for miles and miles) pressure is 58PSI.