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      12-05-2012, 03:47 PM   #12
Lieutenant Colonel

Drives: 2011 335d
Join Date: Aug 2012
Location: MidWest

iTrader: (0)

Previous thread where filtration was discussed with lots of good info:

And official specs for our d's fuel filter:

It's actually spec'd pretty good, and also separates water (although you can't drain the water, so if you get a big slug of water I'm guessing bad things would happen, as evident from the example pointed to in the first link).

To be fair, I've owned 6 diesel vehicles, all but the 335d had water separators, but I've never found more than a drop of water in any of them.