Have had diesels for 12 + years, an 8.9L in the DP I used to have and the little 3.0L in the Gemini. Other than a separate water separator filter in the 8.9L which I changed at every service, along with the fuel filter, I never worried about it, and never had a problem. Have to be honest, don't even know for sure what the 3.0L has, but since the Mercedes dealer services it, I know they won't be shy about telling me what it might need and when.
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