Cars that are 88 and older cannot use synthetic. When I was at training for Valvoline Motor Oil co. they said that the seals in the engines from 88 up can use the synthetic but the older ones cannot due to the chemicals and detergents in the oil, will cause the seals in the older engines to blow out because it will literally eat away at the seals.

Fuck, that was a run on sentence but oh well haha. What year motor/mileage ect.