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Old 01-13-2013, 09:56 AM
Supercourse Supercourse is offline
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Mein Auto: 2004 X3 2.5i
Originally Posted by x3brian View Post
... and the filter becomes quite nasty after 15k.
That's what I find too.

It will depend on your operating environment, but about once a year seems like as good a number as any.

I don't think any auto maker can put a dependable or meaningful time or miles recommendation on it.

The activated charcoal has a noticeable effect when travelling behind an oil burner, or a big block V8 that has just put their foot to the floor to merge onto the highway.

If the charcoal is no longer doing its job, that can be as good a sign as any to change the filter.
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