well, when i have my benz oil changed there i take in a mann filter,usually and watch while they put in rotella 15w40 oil. i dont see where i can go too far wrong.
at the dealer i wouldnt be able to watch and so who knows if they put in the oil specified or not?
i have changed my own oil enough there is not a lot of fun in it anymore, especially if it is cold and snowey or rainey out.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.