[Bob In Ct]

If it were me, I'd be using 5W-30 Redline. It has higher ZDDP (1,200 PPM) and Moly than oils having the Starburst symbol. 20W-50 is very thick and would probably damage the engine during start-up especially during cold weather. If I had a roller cam and rockers I would just use 5W-30 Mobil1.