Oil is more religion than science. Yeah the wrong oil or viscosity can certainly screw you, but there is little difference between optimal and good enough.
I know a guy that's had multiple ~700hp big block Chevy engines, doing drag and drives, buys the cheapest walmart shelf oil, changes his oil regularly, periodically sends oil in for analysis and it always comes back good. Put tens and tens and tens of thousands of miles on those engines.
Me, I adjust viscosity to see the oil pressures I like while driving, and put a zddp additive in my non-roller engines, run the engines hot enough to burn off moisture and any fuel that got by the rings, then change the oil regularly enough it doesn't sludge up.
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"How I learned to stop worrying and love the OHC Pontiac L6"
The Silver Buick- '77 Skylark coupe w/455, SPX, MegaSquirt 3 & TKO-600 (Drag Week 2011, 2012 & 2015!)
1969 Firebird with a turbo'd Pontiac L6 controlled by a MegaSquirt 3 and backed with a microsquirt controlled 4L60e and 4.56 gears! (Drag Week 2018!)
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