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I recommend every 50,000 miles if it does not have a permanent filter.
How often should you change the fuel filter?
Often
Follow the manufactures recommendations as listed in your owner's manual. If you do not have one, I advise you to get one. In the mean time change the oil/filter every 5,000 miles.
Every 60,000 or 48 months
Change the oil filter every time you change the oil.
How often need to change the fuel filter for a 2001 BMW 325i?"
Change the oil filter every time you change the oil.
I change mine every 35K.
The word filter explains it all, alike your house AC filter that you change so often to ensure you stay cool, I recommend that you change your gas filter twice a year.
You should change a furnace filter every 2-4 months.
60/80000 klms