I have been reading on other automotive sites that using a K&N filter is just about guaranteed to ruin your MAF sensor. They claim that driveability problems may not show up for 3 to 4 months. These are claims by auto mechanics, not end users, so I would think they should know what they are talking about. I wish I would have know this before purchasing one of these filters. I have been only running it for a couple of months with no problems yet.
Has anyone here running K&Ns seen any MAF problems ?

I believe that it isn't a problem with a new K&N filter. I've been running with an oiled K&N type filter for 3 years now with no problems.
The problems arise with filters that are cleaned and re-oiled improperly. If you apply too much oil, it will bleed into the intake tract and coat the delicate MAF sensor causing it to have erroneous readings.
I made this mistake with my Jeep once, but fortuneately it doesn't have a MAF sensor and all that happened was the oil coated the intake tube and made a mess inside the throttle body. A little bit of cleaning solved the problem.

Exactly SB! The problem is the OIL getting into the Sensor itself! Some people OVER-OIL their filters & then can't figure out why down the road they need a new sensor.....They blame the K&N Filter, when in actuallity THEY WERE to blame NOT the Filter!

BMW owners have had consistent problems with K&N filters and MAF sensors. Of course, as soon as the dealer sees the K&N in there, your warranty is void on the MAF, and you are coughing up $500 :(

To be honest I wouldn't touch a K&N. I think they make a good product but the benefit/performance increase does not outweigh the potential damage that could be created.

Just my opinion....

The Rat is on the money. If you can manage NOT to overoil your filter, you won't have any problems. It'* a simple case of reading the instructions. To be extra sure, I lightly blot mine with a lint free rag before putting it back in. I've never had a problem with them in over 20 years of owning/driving, and I've had them in nearly every car, including my last 8 or so that had MAF sensors.

It HAS happened, but it'* extremely rare, and usually the owner'* fault.

K&N'* been in my car for a while now... it'* all about not overoiling... but just how much is too much? :?:

I mean, I don't remember seeing any explicit directions on how much oil on the instructions... how much is too little?

Used to have a K&N drop in, I cleaned it when I got my intake and cone, and gave it to my mom to put in her 92 Olds 88. The MAF died two months later. Dad didn't say it was covered in oil, though maybe he doesn't want me to feel bad. I've cleaned the cone in mine, and was more careful with the oil this time, no problems yet.

I watched the guys on a TV show apply the oil to the K&N.
A light bead of oil along each and every pleat all the way along. You have to have some patience.
I think by the time mine needs to be cleaned, I'll just buy a new one. They aren't that expensive. Certainly much cheaper than a MAF sensor.

Thanks guys. The over oiling problem makes sense. I would not imagine K&N being around very long if their filters were messing up everybodys cars.

VERY good point. Thank you!