Yeah, I had some experiences...
Ended up costing me $300 to have the coolant flushed because some idiot topped off the Jeep's coolant bottle with washer fluid. Brain dead morons work in oil change places.
Then again, I had the Ford dealer do the oil change on my old Focus while on my lunch hour from the powersports dealership. Drove it back to our shop and walked out at quitting time to find all the oil on the ground. Dipwad rookie tech forgot to tighten the drain plug. They towed it back and had a "better" tech fix it.
