When I had my truck or other high performance car I used
oil that was manufacturer recommended so as not to void any warranties. Believe me when a thirty thousand dollar caterpillar goes down the first thing they do is pull an
oil sample. Now most of our engines are not stock and to varying degrees modified. That is the info I'm after. The oils and viscosities to use. My engine dynoed out at 420 hp. I think that is pretty fair for a small block. I just need the info to make a wise choice of
oil. Tom