Oils
I ran stock cars for many years and used Mobil 1 20W50 with out any problems. I still use Mobil 1 in my Street rod/Drag car and no problems. Any of the Syn. oils are okay its just a matter of preference. Do not use Syn. oil to break in a new engine. Use regular weight oil to break in your engine then switch to Syn. brand of your choice. Hope this helps.