So at 80-90F should I be using 5w30 or the 5w20 I use now?

^^ i think you are fine with 5w20... in the south, when it gets to 95+ with high humidity, the heavier weight works... if it makes you feel more comfortable, use 5w30 at that temp, it wont hurt your engine... i use 5w20 still in socal, maybe i will use 5w30 next summer..

Thanks for the suggestion, I know most of you are very particular with their 8's as I am.