[brsexton]

I starting using systhetic in my 99 Mazda Protege around 20k and then at 70k it sprung an oil leak at the main seal. I was told at the dealership that the Synthetic caused the problem. I did not have it fixed due to the cost and drove it until 81k and traded it for the Alero. I decided I would not use synthetic with the alero becasue of the leak problem with the Mazda. Plus I got a 100k warranty with the Alero so as long as I change the oil every 3k, I don't care if the motor blows because it will be fixed for free :thumbsup: .