The only thing I have noticed other than how incredibly nice to drive my 350SDL is ... well, is the 50% blockage of coked up oil in the intake manifold and cross-over pipe ... perhaps related, probably not?

Used to get an occasional pause with a large puff of brown smoke ... removed manifold and cross-over, dipped them about 10 times, and reinstalled with EGR disconnected ... no more ... drive better, too.

Potential "nuther theory" that junk gets into the 1 or 2 cylinders? EGR and oil fume line from valve cover are too close to one another, causing the coking?

Just some thoughts ...

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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg