I have never had a issue with the dealership from changing my own oil but a friend of mine that took his s2000 to a quick lube place out here in Vegas lost his power train warranty after the idiot at the quick lube forgot to put oil back into the motor after draining it, he said he left the place and pulled up to a light next to a old nova revving his motor so he was revving his motor to 5-6 grand he said he heard a loud pop and then saw smoke poring from the hood and neither the shop or the dealer fixed it, he ended up trading the car in with a blown motor and he lost his ass on that deal