I use the oil change indicator and change filter every second oil change. It's more important to use a good filter with the o-ring on the bottom (like the Mahle) so that it doesn't crush. A filter is done for sure when the pleats have ripped no matter how few miles.
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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)
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