I have known Justin, the owner of United Diesel for years. He has done work for me both on my 617 Mercedes Diesel (including the injection pump) and my Duramax pickup and always high quality work at fair prices. Justin told me that the volume of their Mercedes business jumped about 30% since the airing of Wheeler Dealer. They have been in business since 1945 (Justin took over the business, along with his sister, from their father). They do a lot of contract work primarily with local fire departments and charter bus lines.