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X3 F25 (2011 - current)
The latest X3 brings some added style and some new features to the BMW SUV family. Talk about the new F25 now!

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  #1  
Old 09-10-2013, 02:38 PM
egunner egunner is offline
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K & N Air Filter

Does anybody have any pro or con information for using a K & N air filter in 2013 3.5.

Gunner

Last edited by egunner; 09-10-2013 at 02:40 PM.
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  #2  
Old 09-11-2013, 10:36 AM
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gfeiner gfeiner is offline
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I haven't used one but I looked into it. Last time I looked those filter run $50 to $60 and that doesn't include the recharge kit. Comparing that price to the cost of a regular OEM filter like Mahn, it would take many years for me to recoup the cost of that rechargable air filter. Unless you drive many miles per year and plan on keeping the car for a very long time it might not pay off, cost-wise. Some websites tout a 3-5 HP gain with their drop-in filters. I doubt that. Even if that were true, I doubt you would be able to tell a difference with a 5HP increase.
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  #3  
Old 09-11-2013, 10:57 AM
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dandanio dandanio is offline
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The tiny bits of oil will clog your MAF sensors. But it is a known issue with K&N filters.
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  #4  
Old 09-11-2013, 11:00 AM
egunner egunner is offline
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gfeiner,

I put one in my X5 and I did notice a 1 mpg difference in mileage, but like you say I didn't notice anything in hp.
I was wondering if it would affect warranty re: turbos? I have read some articles about that on other makes of vehicles.
Gunner
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  #5  
Old 09-11-2013, 11:11 AM
egunner egunner is offline
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Quote:
Originally Posted by dandanio View Post
The tiny bits of oil will clog your MAF sensors. But it is a known issue with K&N filters.
dandanio,

Thanks for the info, I didn't know that. I probably should clean my MAF sensor in my X5.
Gunner
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  #6  
Old 09-11-2013, 11:23 AM
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dandanio dandanio is offline
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Quote:
Originally Posted by egunner View Post
dandanio,

Thanks for the info, I didn't know that. I probably should clean my MAF sensor in my X5.
Gunner
I had that happen to my Jetta TDI, it started running weird, lost lots of power and the mpgs were 2/3 of what it used to be. That's how I know.
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  #7  
Old 09-12-2013, 08:16 AM
UncleJ UncleJ is offline
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Had used K&N filters in other cars, including an older 3 series, for years with no problems. In fact still using one in a Tahoe with over 200K miles on it now. I also really can't say they made any difference in performance. I have heard the MAF story and from what I have read it seems as if the problems came when people cleaned and then re-oiled their K&N. Right out of the box the filters seemed to cause no problems. That leads me to suspect there may have been some "over oiling" of the element that caused difficulties. Hard to pin down, but that is what I suspect happened. In any case, I have never had a problem with the MAF and I have cleaned and re-oiled (lightly) my element on several occasions.
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  #8  
Old 09-12-2013, 12:19 PM
Coder Coder is offline
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I use a K&N filter on my old Bronco. Can support the over-oiling = MAF sensor contamination theory; takes a bit of practice to get it right. Not that hard to clean the sensor but not worth the risk, IMHO, on a BMW. I do believe there is some measurable power gain, at least on a dyno.
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  #9  
Old 09-12-2013, 04:16 PM
The X Men The X Men is offline
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Wouldn't the turbo push thru more air than any increase a K&N filters can let thru?
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  #10  
Old 09-15-2013, 08:41 PM
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Pat_X5 Pat_X5 is online now
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K&N oiled air filter caused a MAF error on my 2002 X5 so I never used that product in any of my BMWs since then -

But a GMC I had used it on never had a problem and for working in the dusty areas, the rechargeable filter was great!

Never risk it on a BMW !
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  #11  
Old 09-16-2013, 06:02 AM
The X Men The X Men is offline
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Originally Posted by Pat_X5 View Post
But a GMC I had used it on never had a problem and for working in the dusty areas, the rechargeable filter was great!

Never risk it on a BMW !
K&N filter actually gets thru a lot more dust than a conventional filter.
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