the best service i recieved was skoda, i mean absolutely perfect, did lots of stuff for free, slotted me in before everyone else.
I bought some tyres online once, brought them in and asked them to fit them, they took the car in straight away and put them on. While i was sitting there a customer went up to the desk to ask why his car was late and they told him they had a car in with a "dangerous tyre that needed sorted first" they were in no way dangerous they were just being nice to me
when i came to sell the car i told them it had a hard life and could they turn the engine light off so i could sell it to a rival garage, they were more than happy, infact now i think of it, it was their suggestion!