Well theres a little low down you should know. These engines the m103, or m104 3.0l engines for the 300e have 1 defect that causes them to be rebuild at around 120-150K, and that is the head gasket seal. It was a poor design and has recently been fixed by MB, other than that issue then engine is like a 400K mile engine. I believe the number 4 or 5 cylinder would leak in that style engine, but for something with low miles your looking to put a couple of grand down.