All dealerships (GM, Ford, Chrysler, Freightliner, etc.) are pretty much the same. The manufacturer has NO control over the franchised dealer.
I begged and pleaded for 2 months for GM to stock fuel filters for the Duramax Diesel that is used in the Express 3500. I called GM customer service and they said, "We can only work through the local dealer network." "We can not force them to stock parts." Gee thanks!
So I spend $30,000 on your van and your can't supply a basic maintenance item? That is just wrong!!! I went to get an air filter last week and they had to special order one. Come guys, somebody is just not thinking!!! It should common sense that internal combustion engines require oil, fuel and air filters. Hey, look in the Owner's Manual that you give us to use. Better yet, try reading it yourselves!
You can't leave anything to chance when you pull into a service bay. I print a list of do's and don'ts for the service tech and I tape them to the dashboard. The oil change guy will try to top off the tranny with Dextron III, but the beefed up Hydramatic behind the Duramax takes Dextron IV. Most dealers don't even stock Dextron IV because they guy they sent to GM training forgot to tell them when he finished the class.
One axiom prevails: LEAVE NOTHING TO CHANCE!!! Document everything they do to your vehicle. I took off from the dealership one morning and headed to Cleveland with a load. Just above Mansfield I hit the squall line and it was an instant "white out." My front end began to drift on the snow covered road. I noticed it also took the bumps a little hard. I dropped off the load and checked my tire pressure. They had rotated my tires, BUT they did not re-adjusted the pressure. Gee whiz, I mean the recommended PSI is only printed on a label in plain view on the driver's side door. I was driving with 80 psi in the front tires and 50 psi in the rear tires. DUH!!! Just the opposite of what it should have been. I wonder where Mr. Goodwrench was when my van was being serviced. Now to add insult to injury, they did the same thing the very next time.
I had another dealership in SC try to slip my fuel tank vent hose back on. It wasn't securely mounted from the factory. When I filled up, diesel would shoot out of the vent elbow on top of the tank just as the pump handle clicked off. They dropped the tank and the service tech put the vent hose on a plugged elbow that was on top of the tank that is used in a dual tank configuration. Something told me to fuel up across the street form the dealership, but I thought, "How could anybody mess this one up." I went on down the road about 50 miles to pick up a load. When I stopped later on to fuel I heard the pump handle click off and then I heard the fuel hitting the pavement below the tank. Grrrrrr!!!! Got back home and my local dealer dropped the tank, discovered the hose on the dummy port and switched it to the actual vent hose return port. By the way, now the service manager puts his own pressure gauge on my tires when they bring it back around front.
Thought for the day: You can lead them to school, but you can't make them think.
The Duramax is great engine. I have about 40,000 on it and it is averaging 21.8 mpg. If I drive at 55 mph it can get 23+ mpg. The trick is to stay on top of the service techs so they don't mess it up! GM's motto should be: "We build a great engine, but we can't service your truck properly."