Not a chance. The vast majority of work done at a dealership is warranty work, which brings in significantly less than customer pay work. On top of that, parts markup is minimal on warranty work.
Going to have to disagree. I worked at the largest dealership in the Southeast, and the service department carries that place.
It's true that they make less on warranty work, but not that much. Most places around here, the warranty labor rate is 90 or more per hour. Techs are still paid considerably less than 30 per hour.
The place I worked turned out over 2000 hours of labor per week. I, by myself, wrote over 1 million in total sales, and that was back in 1998. And we had 8 more like me, plus the truck shop.
Figure back then the effective labor rate (warranty, customer pay, and maintenance, which is lower) was probably 70 bucks per hour, that's 140,000 in just labor dollars coming in, a WEEK. That's not counting the parts markups, (which are just stupidly high on customer pay) rental money made, (handled through service also) and bonuses and spiffs from Ford and BG, who provided our flushing chemicals.
You also have to remember that parts and service go hand-in-hand. Our parts department was (and still is) so big that they now have a separate building, damn near as big as the entire service/parts dept on the lot, as a parts warehouse.
The body shop is the one that most dealer owners would love to get rid of, and many in fact, have. That's where most of the complaints come from.
I suppose at some smaller dealerships, things could be different, but a well-run service department at a decent-sized dealer is definitely a money maker.