Dirk is THE BEST! He is the guy who solved what 3 other Mercedes dealerships couldn't, and he did it in a phone call, and out of kindness. My husband was driving back from Denver to Northern California when our car wouldn't start. Each time, it would eventually start up. But, the problem persisted, and was getting worse. He'd just had it serviced, in Denver and they couldn't figure out what was wrong, but suggested an new ignition ($650), saying is "might be the problem". He took it to 2 other shops, one said that it was that the first shop didn't let the glow plug warm up, and nothing was wrong. The third shop agreed that it could be either the ignition or not. He tried starting it over and over and it seemed to be working, so he decided to start the drive and have our shop at home look at it when he got here.
But, at the first rest stop, just east of Grand Junction, it did it again. At this point he wanted to stop and try to get it fixed. It was Saturday, and all of the shops were closed. We found Dirk's number online, and called it. HE ANSWERED ON THE FIRST RING! He explained that he was in vacation for spring break, but he still wanted to help. I gave him the symptoms, and he told us to check the DEF or blue liquid. Sure enough, the 8 gallon reservoir was almost empty! My husband put in 2.5 gallons, and it worked!!!! (This was after a complete servicing at the first shop, and the other shops' claims that they "topped off" all the fluids.)
Dirk even called back to see if it was ok, and yes indeed it was! What a guy, knowledgeable and kind! (I bet he's good looking and can cook, too!) Anyway, I can't believe how lucky we were to find such a caring person. My only regret is that we live about 900 miles from his shop, so he won't be our regular mechanic. THIS GUY IS THE BEST! Big thank you, Dirk!