I`ve posted this before, but back when we were racing the hemi , we used 3-4 diff kinds of oil/whatever our ''small time'' sponsers would furnish, the hemi did not give a dam what brand it was, and not particular to 30/40 or 50 weight racing oil Just didn`t matter < as long as there was plenty of good flow! Oils have changed a bunch since then, but as long as its reasonably clean and plenty of it , it still don`t make a hell of a lot of diff. I have used even Walmart tech oils in my 505 and a few higher priced brands, dodn`t seem to make a piddlers dam !