I have known people who worked at those quickie lube places. I would never trust my car with any of them.

I once saw them drive a car into the pit. Well, just one wheel, but still, it was a good ten minutes of entertainment watching half the staff sit on the opposite corner to try and drive it back out.

A friend of mine once caught them trying to put transmission fluid in his engine instead of oil. I don't think there was any malice, but they're teenagers who just don't pay any attention.