I use the brand name Driven 10/40, that oil has all the lubricating metals in it. Needed for a flat tappet cam. The Dart starts cold at around 80 psi when it gets to operating temperature it runs down the road at 3000 rpm at 40 psi. About the paint peeling my friend wanted more oil pressure so he add a thin washer behind the cotter pin on the oil pump relief spring used a 1/2 drill to prime pump. Started engine reved a bit shut it off. I looked under car for leaks and saw a chunk of white paint. It came off the oil filter. He said it buried the oil pressure gauge