I read a post from a guy with a 1983 300D, 215,000 miles, with all original glow plugs. 27 years and all those miles....that's pretty impressive.

http://www.peachparts.com/shopforum/showthread.php?t=286890&page=2

Any others with that kind of glow plug longevity?

I replaced all five in the 92 about five years ago with 175,000 miles on it. Last year, in my first year of ownership of the 91, I replaced four of the five with only 80,000 miles on it. I guess the previous owner made lots of short trips.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 79k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife