I've got a 2002 Grand Am (3.4L V6) with almost 99,000 miles on it.
I recently switched over to synthetic oil (Valvoline Max Life Synthetic) b/c i had a coupon from vioc and figured i'd try it out. Now, i've gotten it a couple of times, but i haven't noticed any increase in mpg. Actually, i've noticed i've lost about 1-2 mpg on average over what i was getting. What would explain that? Seems to have been getting better lately though.
Anyway, now I'm thinking I don't require synthetics in my car, b/c it doesn't haul anything and I live in Missouri which doesn't get temperatures that are TOO extreme.
Is it harmful to my engine to switch back to the Conventional Max Life?