I can’t say I blame them, working on old cars, especially mercedes and German cars is much more difficult than working on new cars. Plastic parts crumble, sometimes there’s lots of corrosion, and it’s just as easy if not easier to rack up a $5000 repair bill on a $10,000 18 year old car than it is to do the same dollar repair on a $45,000 8 year old car. There is very little winning with old car repair for the shop , or the owner that doesn’t really want to spend the money it cost to repair.
Old cars, especially Mercedes, require lots of time, money for parts,and patience. The Lexus dealer in Naples just serviced my mother in laws 2001 ls430 with 210,000 miles on it. She purchased it from a friend in the rust belt area and transported it to Florida. They replaced the hood latch and cable. It ended up running her $1200 and a list of problems she should fix totaling $3500. They did the hood repair, and now she is going to buy a new car and take her 2016 Lexus to Florida, because she now realizes how much an old car will cost. Good choice, , as it was a terrible choice to buy a 21 year old car of any make with 210,000 miles to rely on.