My boss is also a mechanic. I've seen him do hours of work for certain people and charge them 0 labor costs and only the cost of the parts - if you're unfamiliar with vehicle maintenance, a HUGE percentage of the cost to get your car worked on is labor costs. Most shops average around $70 per hour or more.
If you're a dick, he can easily take his sweet time on your car and charge you up the ass.
If he likes you, he may hook you up. At the least he won't **** you over.
Many will even just not do the work, say they can't fix it and send you somewhere else.
Trust me, don't be rude to your mechanic.
what expensive your boss takes for labor costs... 
