I only ever took my car once to a factory mechanic,i am used to always doing my own work,ever since i was 17,my brother built and raced cars and advised me to do it all myself(learn from your own mistakes etc.),well, a few years ago i bought a brand new nissan patrol deisel,not knowing a lot about deisels and worrying about warranty issues,i decided that nissan could do my servicing,the first service was at 10k,so i shot the car in for it's scheduled service and decided to hang around unbeknown to them.
I am sitting on a fence reading the paper near the service centre and next thing my 4wd comes barreling past with the motor revving so hard that it was literally yelping,this clown was trying to do a compression lock-up!
Well,i went back to the centre and who was driving my car?,none other than the actual service manager,well it got physical because he tried to tell me that he had to do this to "test" the 4wd,lets just say i never went back and nor was i welcome either!
The upshot to this was,i looked around and found a guy who specialised in four wheel drives(specifically nissan and toyota),he was a repco franchisee and he was absolutely awesome with the car,he is now not there,which is a shame,but i have reverted back to doing my own work again!
So there are the odd occasional good guy out there,just not many!