I am intrigued by the FSS on my new 98 E300D....have read various threads on how it works, dino vs. synthetic, how the system works somewhat differently on diesels, etc.... I don't know that I'd put a GREAT deal of stock in it....will probably just change oil (M1 5w40) at some sensible interval. But I am curious as to whether anyone has had an oil analysis done at or near the FSS interval and what you learned. Essentially I'm asking whether we have reason in the sense of independent confirmation to believe that the FSS should be trusted.

I guess if I sound skeptical it's because this is the same company that told us the tranny is sealed for life.....I mean change fluid/filter once at 39k miles....I mean change every 39k miles.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 77k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife