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08-28-2009, 06:01 AM | #1 |
Flycaster
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Low mileage, engine air filter change frequency?
Just went off 4 year BMW warranty. My 4 year old 2005 2.5l Z4 has 17.5K miles. No real hard driving. Driven in south Florida. How often should I be changing the engine air filter?
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08-28-2009, 12:21 PM | #3 |
Flycaster
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Not sure what you mean about the filter oil smell. Doesn't sound good to me. Also, I've read the the K/N filters are nice, but they really, from a tested point of view, don't do much for the car, but certainly are more expensive that any good quality filter.
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08-28-2009, 01:31 PM | #4 |
Second Lieutenant
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Drives: 2010 128i Conv.
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Location: Aiken, SC
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+1. Stick w/OEM filters.
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08-28-2009, 04:09 PM | #5 | |
Captain
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Drives: 2023 Hyundai IONIQ 6 SEL AWD
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Location: Seattle, WA
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OE paper filter
Quote:
Best practice is to open up the air box at every oil change and examine the filter. Clean all the debris out of the air box and vacuum off the filter. If the filter is still showing signs of being dirty then replace it. I'd stick with the OE paper filter P/N 13 72 1 744 869 that will run you $13.78 from Autohaus AZ. Don't forget about the cabin filter P/N 64 31 6 915 764.
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Jim Millet
2023 Hyundai IONIQ 6 SEL AWD Ultimate Red SOLD: 2007 BMW Z4 M Coupe Imola Red |
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08-28-2009, 05:24 PM | #6 | |
BMW Fan
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Quote:
It's just folded paper with a plastic frame. It would last 40 years if you only drove 1000 miles per year. K&N are not recommended because the oil can foul the airflow meter and cause problems. The factory paper filter is just fine. If they could have claimed 5 or 10 more HP by changing the paper filter, with all the millions they spend on engineering, don't you think they would have done so? It's not the limiting factor in airflow or HP for the engine. Dyno testing with different filters or no filter at all indicates no difference in engine power. |
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