Was doing a search on the topic....this one was all that came up....thought it would be amusing to revive an old thread.

I never have diesel lying around, so using ATF when replacing main fuel filter makes sense for me....as long as it doesn't do any harm. Probably some superstition/folklore stuff going on....it's fun to think you're doing something to help your car (even if there's no basis in fact).

What does anyone else do?

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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