Penn Grade, VR-1, Driven, all very good oils. Rotella, also a good choice. STP, not so much, read up on it and you won't ever use again. Race engine need extra protection due to heavy valve springs, yours doesn't. Go to your local GM dealer and see if they have EOS, an over the counter oil supplement, add a 1/2 can to any oil you like. Lucas sells a similar product that works well. Your valve spring fully compressed are still likely less pressure then some racing springs uncompressed.
Quality products don't come cheap!
Last edited by Joe H; 01/30/2021 3:14 PM.
