Engine Oil: what's best?

[Dave]

I used Penrite full synthetic 10W50 last oil change based on others' recommendations too. I won't be using it again since the belt tensioner on cold days doesn't pump up for 3-4 seconds. The tensioner was fine before I put that stupid oil in it.

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Erm....what does oil have to do with a tensioner... I suspect another issue rather than the oil