Welcome to the forum. As an ex GM mechanic having worked on my fair share of 6.2 and 6.5 diesels I can tell you that the basic fundamentals are the same as far as mechanical operation of the engine. The major differences are in the rest of the vehicle. The benz will require a bit more attention and care but don't let that scare you if you like to "tinker". You can find an answer to almost any question here on this forum, usually several answers on the same topic!!.