most aftermarket parts are good and usually have a warranty. Dealerships usually put down aftermarket parts in order to sell factory parts, but if they have to fix a used car, guess what they do?
if you have an unlimited income, go ahead and use factory parts. have you ever wondered what companies make the parts for Chevy, for example? they do not make all the parts that go in to their cars. I started to figure this out when I saw the factory aluminum wheels on my '79 firebird were stamped ''western wheel'' on the inside of the rim