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Yeah, I don't believe in a "best" oil. Especially calling a single weight the best. Most engines will have some parts that like a certain weight, and other parts that prefer a different weight.
Then there's the whole additive deal, which is a sad story these days. I generally run my engine on 0w-20, for fuel economy and cold starts (5w-20/5w-30) is specified. But my little "opinion" is run something thin, and synthetic, and toop it off with a little blue bottle of STP oil stabilizer. It's thicker than I'd like, although I've had no measurable side effect... but the STP is NOT for an odd2.. it's full of zinc and is good for the engine and bad for the cat.
You gotta pick the lesser evil with oils. But as long as you change it and maintain your car, your average ford or Honda will totally do 500k on cheap oil and filters without new parts. I like my engine perfect, but I honestly don't think paying for synthetics is cost effective, unless you don't do your own repairs, AND drive an expensive car.
Over 300k miles, that's 100 oil changes. $20 for conventional, $40 synthetic at fit prices. Over 300k, conventional oil could save you $2,000.
I drive an escort, so an engine failure costs me like 200 bucks plus new gaskets lol
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