I run Mobil 1 10-30 as per the manual. I have the turbo and the manual calls for synthetic AND drain intervals of 5k. Given that, the price of Mobil 1 is better than Amsoil.
I also run Mobil 1 at 7,500 intervals on my wife's C280.
I've spoken to MANY mercedes mechanics who use Mobil 1 over long lives of their older benzes (300k) and after they take the engine apart for a valve job, they say the results are great.
Just stay away from Syntec 5w50. Lots of additives in there to give that big a spread (5-50). They break down earlier than the oil.
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