Somewhere I read about adding biocide to diesel fuel to kill microbes, or algae, or somesuch. Is this common, should it be done at regular intervals, etc.? :confused:

Wondering if I should do it "just because"...

BCingU, Jim

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'96 E300D 58k mi (wife's daily ride)
'95 Audi 90 118k mi
'92 GMC Suburban 138k mi
'85 300SD 230k mi (my daily ride)

Typically you can see some specks of this collected in the pre filter. The specs are about the size of the tip of a well sharpened pencil lead, are dark grey and are soft to the touch.

Unless there is a large deposit in the prefilter, or the car is not driven much, you shouldn't have to worry too much about it. That said, it would always be better to treat it and eliminate it.

Good luck,

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Larry Bible
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles