2002 Blazer started right up

Don't want to be an oddball so what oil should I use?
These aren’t picky. I’m using whatever I get on sale or on clearance. I have some Rotella gas truck and M1 5w30. Currently using Oracheln Farms house brand conventional.

If I had to go out and buy an oil at normal price and if availability wasn’t an issue, I’d buy an 0w40 or 5w30 A3/B4 just because.
 
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