Techs, mechanics, wrench turners whatever you want to call them are paid commission. If the labor guide says it take 5 hours to put a crankshaft seal in , he gets paid 5 hours no matter if it take 5 minutes or 10 hours. Now, if that vehicle is under warranty then the guy only gets paid what the manufacture says he gets paid to do the job (warranty labor rate vs. customer pay labor rate) and that's usually going to be a whole lot less than what it would be if it were a customer pay job , sometimes less than half of what he should be paid. So tech gets pissed off and starts not doing services, putting parts in his tool box and generally doing a halfass job for feeling like he is getting halfass compensated. Techs at most dealership hate hate hate to do warranty work because it's too damn hard to make any money.
I have been confronted many time with my customers saying "you charged me 3 hours and it only took you an hour". I ask them if they get paid for what they know or what they do? (I work on high end european cars so you can imagine the answer I usually get). I explain to them that the labor guide is used by most every reputable shop/dealership and the fact that I have done job X 68 times before means I can do it faster now than I could the first few times. Would you rather have someone doing this job that has done it over and over again or a newbie that most likely is going to screw something up? Dealerships usually avoid this confrontation by letting the car sit after it's repaired for however long they need to so the customer doesn't feel like he got hosed(if he was at the dealership, he probably got hosed anyway). I personally prefer the blunt ,direct, no bullshit, honest , explanation of why you got billed 5 hours for something that took me 3. I also will cut billing time off a job I've done a 100 times and feel like the labor guide has over allowed time to do (really). Things that are super quick to do we usually charge nothing for and I've had customers say "you need to charge something". My response is I've got a 4 year old and a 6 year old , I need to make a little bit for a loooooong time, not knock your head off and never see you again. Some may not agree the the 100% honest approach and let me assure you at the shop management seminars I've been to don't really encourage it. We've been in business 26 years, don't advertise, aren't even in the phone book (other than one line white page) we've yet to have a day where we weren't busy with plenty to do for the next day.