Hey guys...new here, but likely going to be spending a lot of time in this forum

I've got a pair of fintails that are both going to receive the diesel treatment, but I need some information on what the differences in Mercedes' diesel engines are so I can make my choices. I'm familiar inside and out with VW diesels, but these engines are a whole different ball-game. I didn't see anything like an FAQ in the stickies, so I was wondering if there's a comparison of the various engine models and years available here, or elsewhere on the web.

I'd like to find out if Mercedes has ever had a direct-injection diesel engine (aside from the new 320, which is well out of my price range), because from my reading that seems to be one of the keys to tunability (and it's supposed to generally make the engine a bit louder, which is fine with me ), as well as contributing to better mileage in general.

Also, if anybody's got any experience with fintail engine swaps, please get in touch with me here or via IM...I'm excited about getting the research started!