Vehicle in question is a 2009 ML320 that has a bad engine. What years and models of the 642 can be used as a replacement? What would be a direct replacement and what might be used as replacement with swapping components. When I look on car-part they seem to pull of ML and GL vehicles, but not 211 e class. Will an e class engine not work for some reason? I noticed the prices on the ML/GL engines seem QUITE a bit more expensive than the 211 version for some reason. I am going to look at one this afternoon that appears to be in decent shape that I can probably get for around a grand. Supposedly it was run out of/low on oil and supposedly will start with a battery. If that is the case and it will crank and start, it must not have been run completely out and probably now has a bad knock. I am not sure if I am crazy or not thinking about taking on an engine swap 642 project.