I have monitored this list for a while now, but have not seem much relative to fuel additives. The exception is during extreme cold to keep the fuel from turning to gel. Of course, MB seems to recommend against them, or at least that is what the fuel filler door states. What is the deal on additives? Are their diesel additives that should not be used in Mercedes? Who uses them year round versus just in winter?

Do they do any good?

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Alan Hamm
'87 300SDL 277K Miles
'89 560 SL 68K Miles