IIRC, later years of the ML either was available with the 3.2 liter I6 M648 or the V6 3.0 M642 turbodiesels. Unless your time is hobby time, and part of the challenge is doing it on-the-cheap, it might be more worthwhile shopping for one of those.

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'06 E320 CDI
'17 Corvette Stingray Vert