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Old 11-25-2006, 06:47 PM
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Location: Reading, PA
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What is the real service interval for a fuel filter?

I'm trying to decide what the proper service interval is for a fuel filter on a MY99 E300. I'm not exactly remembering at the moment what the interval is in the manual, I'm thinking maybe it's 30K, or 45K. Whatever.... I haven't changed mine yet, and I'd like to determine when I really should.

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Old 11-25-2006, 11:02 PM
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All it takes is one bad load of fuel to clog a clean filter. A lot of folks just let the filter tell them when it's time for a new one. The loss of power is pretty noticable when the filter gets obstructed.
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Old 11-25-2006, 11:17 PM
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30k is scheduled, but I seem to do mine every 20-25k. I can usually tell when my mpg starts going down.
- Brian

1989 500SEL Euro
1966 250SE Cabriolet
1958 BMW Isetta 600
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Old 11-27-2006, 09:41 PM
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It's every 60,000 miles for both filters on the E300TD.

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Old 11-27-2006, 10:03 PM
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Location: Mass.
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a very senior member here would say until it won't pass fuel anymore..
for me i changed a filter that appeared to be good in the end (the canister type) and have been running it's replacement for at least 4 years.. with no issues.
of course a w123 has the clear prefilter to be able to judge things fairly easily.

when in doubt change it as they are cheap insurance and keep a spare in the trunk!
1984 300D Turbo - 231k....totalled 11/30/07 RIP
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Old 11-28-2006, 11:33 PM
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Location: Annapolis,Md
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The clear pre filter is the way to go. Since I changed to a clear pre filter I haven't changed it for 50,000 + miles. I do change the main filter about every 25,000 mi because my 603 has remined me to do so twice - just a slight lessening of power. But, as previously said, one load of bad fuel and you may need more than one filter change! Try to buy your fuel at a station that sells a lot of diesel fuel; where the local truckers use.
Paul 1987 300 SDL; 2000 ML; '69 MGB; '68 VW Fastback
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