I have to agree with Bluesman on this. I have a good friend who services my Lexus for me. He is head tech guy at Mercedes and has worked for them for around 20 odd years. He has always told me and my brother never to buy a Mercedes. He said if you do buy one, make sure you have some savings to spend on repairs because they are rubbish for reliability. The turbos tend to blow, gearbox issues, radiator issues, ecu issues. He also said whoever tells you mercs are reliable, dont believe a word they say.
So good luck.