I had one mechanic who used to charge an arm and a leg, but I tolerated it because the work was always perfect. However, one day I drove off after a service and the temperature gauge immediately rose. The idiots drained my radiator and didn't replace the fluid. Nearly seized the whole motor That was the end of that mechanic.

My Datsun mechanic is a saint. He's known the car for about 15 years and has become a dear friend.