I like amsoil, and have heard good from scheffers too. I also have heard good about CenPeCo aswell, used in some hard run motors! I use Valvoline VR-1 50W race oil. We ran that oil in our 526ci ARIAS, pro-mod motor, one of the hardest enviroments around! I run that in my truck since my oil tends to get diluted and its runnin strong
20-50 is a much better choice than strait 50w in most race motors. Scheffers is good stuff.
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