I had to take my '04 Malibu in this morning because the check engine light was on. It turned out that the ratchet set for the gas cap was malfunctioning. Since it was under warranty, it didn't cost anything. The service guy was so nice and I was in and out of there in less than an hour! He even updated my computer software (in the engine) for free. Everybody I spoke to was friendly. I'll definitely go back the next time I have trouble (knock on wood!).