K and N filters: Any reason not to use them?
09-20-2004, 09:56 PM
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'07 Porsche 997TT
K and N filters: Any reason not to use them?
Just had a Renntech stage 1 kit installed last week, but the wrong K and N filters were sent. Shop is waiting for new ones. There seems to be some controversey about these? Any reason I would not want to use them? Will my dealer know what to do when I bring the car in for service?
I want these filters too...
09-22-2004, 01:05 AM
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2001 BMW M5
A lot of times, the oil used to coat the filter and make it pick up the dirt gets sucked into the the intake port and can coat the MAFS wire causing misreadings and a fault code. I know the AMG 5,5 does not use MAFS, so it may not be an issue on those engines though. In all honesty, I have found no difference in performance with the K&N filters in place of the stock units, only more fault codes show up.
09-22-2004, 10:21 AM
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'07 Porsche 997TT
Originally Posted by awiner
I've been using K&N for 15 years. Never had a problem. DON'T over oil them however when it comes time to clean and re-oil.
09-22-2004, 11:51 AM
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You clean and re-oil them every 50,000 miles. K&N sells a "Re-Charge Kit" for about $10 to accomplish this.
It is easy enough to do yourself, however, mechanics can do it as well.
The thing is that you don't want to over oil them, which is a common problem and can cause your Mass Air Flow sensor to fail.
It is easy enough to do yourself, however, mechanics can do it as well.
The thing is that you don't want to over oil them, which is a common problem and can cause your Mass Air Flow sensor to fail.
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09-23-2004, 10:46 AM
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2001 BMW M5
If you do decide to go with K&N, I would heavily advise you to try to suck up some of the oil on the new filter before installing. I have seen many new filters cause MAFS issues in BMWs. Try to soak up some of the oil with a dry paper towel of some sort. Hope this helps.
09-23-2004, 12:32 PM
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i also have never had any probs with k/n filters. JUST DONT OVER OIL THEM. go to k.n website and it will tell you how much oil to place on the filter. is what i do is oil the top of the filter and then stand it up and let gravity do its job, the oil will distribute evenly.
09-23-2004, 01:15 PM
#11
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I don't have any problems with the filter either. Before I install the filters I did let it sit in open air for 1 day and soak it lightly with paper towel.
John
John
09-27-2004, 11:48 PM
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2006 s2000
I use it in my slk. When I got it. I open my air box and put it in. No problem what so ever. I didnt know about the MAFS thought. Thanks guys ill keep oil in mind the next time I clean and reoil the filter. 
09-29-2004, 12:28 PM
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AMG C43, 1999
When I get a new K&N filter I take it out and spray Simple Green on it and wash it real well. Then I let it dry and lightly spray the oil on the filter and I mean lightly. About 1/3rd of what oil would be on the filter as seen when purchased new.
This has worked well for many car and trucks and still maintaining good filtering.
Jeff
This has worked well for many car and trucks and still maintaining good filtering.
Jeff
