It is quite a shame that the only diesel engine available in the most desirable Mercedes models ever (later W126, W140) is a flawed engine. There's a perfect 1991 350SDL for sale on eBay by Herbert Philips (a forum member here). The only reason why I wouldn't even consider purchasing it is because of this engine problem.

For you techs out there, would it be possible to swap that engine for a 3.0L I-6 from the 300SDL?

__________________
1999 Mercedes-Benz S600, 103K miles - garage queen
1988 Mercedes-Benz 560SEL, 89K miles - daily driver
2007 Hyundai Sonata Limited, 31K - daily driver