Originally Posted by sixto

1986-1987 300SDL with 6 cylinder 2 valve turbodiesel

You probably don't want a 1990-1991 350SD/L (sedan) or 1992-1995 300SD/S350 (sedan) for their risk of bending rods. You can find a cheap one that billows smoke then swap in a 3-liter block but with the 92-95 you're facing the teething problems common to early W140s.

Basically you're looking at a single engine family from 86-99. It's basically the same block under a SOHC or DOHC head.

How about a 2005 Passat TDI?

Sixto
87 300D