It's supposedly from when people clean and re-oil the filter they sometimes apply too much oil which supposedly can get pulled out of the filter element and it coats your MAF.
I've used K&N for nearly 20 years in all sorts of cars and never had a problem, so who knows, plenty of people talk about all the oil treated filters as being a risk, I've never had a problem ... maybe I'm lucky !
The filter issue is like tuning companies ... everyone seems to have a reason to dislike the one they didn't choose imo.
Here's some info from K&N disputing the oile/MAF issue ... it's about half way down :
MASS AIRFLOW INVESTIGATION RESULTS
K&N air filters use oil treated layers of cotton gauze because in our opinion that is how you build an air filter with high airflow and great engine protection. Nevertheless, if our oil caused a problem, we would simply eliminate it from our design. So when we occasionally hear about these claims from consumers who are told this by a dealership or “the grapevine,” we do some investigating. We’ve been flowing high volumes of air through filters on our test stands for decades and we know that oil does not come off our filter. We have become very aggressive in pursuing every instance of alleged MAF sensor failure brought to our attention (as of March 2006, we’ve had approximately 400 claims compared with over 7 Million air filters sold during the same period). We inspect MAF sensors under a microscope to see any contamination that may be present. We had a special piece of testing equipment built to electrically test for MAF sensor failure. We perform chemical analysis of alleged contaminated sensors to determine the source of the contamination. We interact directly with the dealership involved. We contact certain car companies to acquire any factual information they may have. In short, we do everything physically and professionally possible to determine what is going on. The result, throughout all this time, is we have not had even one instance of a MAF sensor failure that resulted from K&N oil. Why do certain dealerships make such allegations if they have no proof at all? You’ll have to answer that one for yourself. To view our testing results and claims history, go to our MAF sensor test results page.
I've got a BMC oiler panel filter and have had it for some time now. Never had an issue, along with everyone I know with an oiled panel filter.
2010 Reflex Silver MK6 Golf GTI
Sunroof - MDI - Superchip - 19" VMR V710 - Kuhmo Ecsta SPT KU31 - VW Racing Panel Filter
Not to inflame this anymore but I agree; where's the evidence? Search the internet & all that I see is all talk & no substance. Its all heresay and most of that is coming from people who haven't even used these types of filters before. If they truly did damage MAF sensors then there would countless stories of this happening but its just not so.
Besides if a dirty MAF sensor is of concern then just buy some MAF cleaner spray. Not hard to do really.
APR V2 Tuned, APR Dogbone mount, APR R1 DV, K&N Panel Filter, SEAT Intake, Forge TIP & FSB, Bilstein & H&R, Whiteline RSB, Full Milltek 2.5" exhaust
08polo, this should get you going. I'd put this and a SEAT intake in first before lookign at exhaust options. These mods will make your car louder as well as adding power.
BMC Air filter
2010 Reflex Silver MK6 Golf GTI
Sunroof - MDI - Superchip - 19" VMR V710 - Kuhmo Ecsta SPT KU31 - VW Racing Panel Filter
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