http://www.knfilters.com/news/news.aspx?ID=422

"There are four words from a mechanic that should trigger a red flag for consumers, Mass Air Flow Sensor. A little knowledge about this “mystery” sensor can save hundreds of dollars and protect car warranties.

If a mechanic or dealership claims excess oil from a K&N Engineering Lifetime Air Filter caused a Mass Air Flow sensor (MAF) failure, it’s not true. K&N has researched, tested and devoted many hours to confirm the use of K&N Air Filters, including over oiled air filters, will not cause a Mass Air Flow sensor failure under any remotely normal driving conditions.

K&N Engineering Mass Air Flow TestingOil does not come off K&N Filters. If a mechanic or dealership claims K&N is the problem there has to be proof. K&N will often work with consumers to recover money for repairs which legitimately should have been covered under the vehicle’s warranty where warranty coverage would otherwise have been available.

“We’ve tested Mass Air Flow sensors and discovered these parts are being replaced when they don’t need to be,” said K&N Senior Lab Manager Rich Dwyer. “Consumers are sometimes told readings from the Mass Air Flow sensor show it is saturated with oil from a K&N Filter. This is not true. Consumers should ask to see the Mass Air Sensor codes and/or get a second opinion.”

Discuss....

 

This has been discussed before, check out these threads:

https://rennlist.com/forums/928-forum/352068-k-and-n-oil-filter.html

https://rennlist.com/forums/928-forum/95132-k-and-n-filter.html

https://rennlist.com/forums/928-forum/80088-k-and-n-air-filter-flow-test.html

 

I don't think a stock K&N will cause problems...its an over-oiled by consumer that causes problems.....

 

And many others.

And, if I recall correctly, no dyno chart has ever been presented that indicates that a K&N filter will add any measurable power on a 928. I believe that I and Louie have posted charts that show that the K&N, on a 928, does not add any measurable power. A 1 or 2 hp difference on two ~300 hp dyno curves is not statistically significant. So, why bother?

 

Great points Dave...........I agree its been discussed to death; my car came with a K&N...........John Speake determined that my MAF was quite sick from a check he did one winter..........rebuilt MAF and new OEM filters since............vroom!!!

 

I will not allow a K&N on any (post 85) of my cars or customer cars (if they listen to me) for the reasons already stated. No power gain. The possibility of harming the MAF - why would you chance it?
If you do use one to save money - $28 a year - then do not buy a 928.

 

Rog - need a regular 928 filter... pm sent

 

I and Louie performed tests that proved conclusively that a stock filter gave more power over a K&N

 

Rog,
I hate to contribute to this already done to death topic, but are saying you think K&N is ok for pre 85?

 

Yeah. I remember that thread now.

Can we call this Horse "Glue" yet?

 

It was just yet another test, hardly conclusive. remember, you didnt seal the air box. if it is leaking, the pressure drop , that normally would be saved, would go through the leaks. Ive the only one that has done the test with a sealed air box, and we got 4-5 hp vs the stock filter, but then why wouldnt you . it is more restrictive and does have a greater pressure drop across it. But again, many factors to consider. remember most of the air boxes leak about .25" Hg if not sealed. meaning, that air is bypassing the filter. the more the restriction with the filter, the more the air bypasses the filter through the leak.

I use the KN filter, but I only use oil on the outside and a little lighter than most would coat it with.

mk

 

There is no hot wire MAF on pre85 US or pre-84 Euro/ROW cars so it will not cause damage. You still run into the problems of it allowing more dirt through and restricting air more than a stock filter.

 

Apparently not LOL ... and I don't recall seeing Mark K there when we tested ... we did actually test open and closed.

 

You are right, i wasnt there, but did my own test. (therefore, im only challenging the "Conclusiveness" of your test)

was the 4 hp gain on both the open and close test? I dont remember seeing the dyno run results. any link?

Im thinking we need a tie breaker test, doing open and closed test as well.

I also tested the optimized inlet for the MAF, where the Ott test was a gain of 5hp and i saw a loss of 4 hp. I wanted that one to work in the worst way, but no matter what i did, i couldnt get a gain on a bunch of runs on the same test day.

Mk

 

I dynoed my car when it was closer to stock configuration and saw a 5 hp increase with K&N. I wonder if it makes a difference which filter is dynoed first and the brains adjust for that filter and don't have time to adjust for the seond filter dynoed? K&N was on my car on the drive to the dyno and thus tested first.