took my rx7 to one of these places once. I made it very clear that it should be warm before turning it off. I even stuck a sticky note over the rev counter pointing at the temp gauge saying they shouldn't turn it off untill the needle reaches a certain point.
got a call the next day "er we can't start your car, i think the engines gone" So i came round and deflooded it. When i looked at the car, no sticky note and the mechanic had no idea that it had to be warmed up. He still insisted that i needed a new engine, at which point i explained to him if it needed a new engine it would because he left it flooded over night. The current engine had only 20k on it, luckily still going strong though.
urgh, some people