Have run K & N's for 10 Years....If you over oil you will get some drops in the intake tube,,, How do I know,,, when I serviced my first K&N filter I read the instructions and thought well if a little oil is good,,,,, more is better??? Annnhhhh!!!
fouled the Mass Air Flow sensor and the truck didnt like it,,,, Cleaned the sensor and the filter,,,, Lightly reoiled filter,,, Problem solved,,,

follow the instructions

and I run a cold Air intake with a K&N filter that is fully enclosed,,,,

 

I agree with cody 459. a waist of time and motor life. Some people have too much of it and fall for it!

 

The only reason all these "experts" spread rumors that K&N's are bad to all the rubes who blindly follow them is, the "experts" can't make money off the K&N's like they can with a $3.00 piece of pipe and a $15.00 generic paper filter that they resell for $300.00.
Besides, a K&N isn't cool because you can't see it in the air box, LOL!

 

...So they intake "cool" (or at least cool"er") air. Performance will suffer from ingesting hot air through an open filter under the hood like that, especially in hot weather.

So true. I always found this rather amusing, myself.

What's the old saying about "a fool and his money?"

 

in my opinion K&N type air filters are a waste of time... maybe they work good, maybe they don't . i don't care!
i just don't have the time or desire to clean and oil them when it only takes a few minutes to change a dry filter and be done with it, and not worry about using not enough or too much oil .....

 

Here is the K&N drop in filter that I have.
Open the airbox up, pull the paper filter out, and drop this monster filter in.
With the stock air filter, my filter minder would always pull, now it never pulls.

http://www.knfilters.com/search/prod...px?Prod=E-0776

 

I took a K&N filter off of the 05. Cone type FIPK filter, all the proper tubing, all sealed properly. No leaks anywhere.

Turbo fins were covered in oil, Dust in the tube and on the fins.

To my untrained eye, that is not good.

Whether or not it was over oiled in the past, the dirt is simply not acceptable. Sooooo. It now has a stock filter box and paper filter in there, until something acceptable can be put on.

 

Years ago one of the oil sands plants up in Alberta Canada tested the K&N filters.
The sand that has had the oil removed blows around bad and is a very abraisive silica sand by nature.
The heavy hauler trucks needed a filter change daily at over a thousand bucks a pop!
Tests were done by using known amounts of sand by weight and weighing each filter after the tests in the lab.
To make a long story short I guess you cant call a fuzzy screen with some oil on it a filter.
There was never one installed on a truck because of how they performed in the lab.
Here is another link of a not so accurate test by a private fellow that did get the same results that we got.

http://www.bobistheoilguy.com/airfilter/airtest1.htm

 

Read this

http://www.jpmagazine.com/shop4parts...des/index.html

 

What, no stock filter for comparison? But then, who would ever buy the high-margin aftermarket filters if customers knew the stock paper filters were as good as any for 99% of all applications at less than half the price?

 

Right on there Ace!
Goosepilot...
When we were doing these tests the K&N sales reps were there as well.
They had been filled with so much hype that they really believed they were going to make the big impression and of course big sale.
They left that day very humble indeed!
When you spends millions on big machinery you dont run out and put a fuzzy or foamy or bright red or chrome thingy from Joes Speed and Sport Shop without a test or two right?
I know what I saw right in front of me the day of that test and it was not pretty!
Run one for a while and then get your oil tested.
Watch for the silicates (sand-dirt, not antifreeze) Iron (your cylinder walls) aluminum (piston skirts bearings etc) on and on to rise.
In my mind running one of these after market fuzzy screens makes about as much sense as running a 100 micron screen for a fuel filter thinking your going to get more fuel flow!

 

Right on, like I stated earlier there's a reason Truck manufacturers go with an enclosed filter system. Also has anybody noticed K&N has change there slogan from best air filters on earth to best intake system on earth? Might be getting more flack from people than just us.

 

The major problem with oiled filters is the guy doing the cleaning and oiling. Any baggy pants, hooded sweatshirt, more money than brains clown...stop myself.... Long before turbo diesels were in pickup trucks I serviced many true oil bath screen filters. Paper filters didn't exist. When paper technology advanced with supportive metal screening to hold it together all diesel engine builders went that way. Why not? Easy to service, great efficiency and bubba can't screw it up. Well he can if he doesn't put it back together right. So now we give bubba a oiled filter to service and guess what? he screws it up and dust his motor. PLEASE...My rig has a AFE Pro Guard 7 filter wrapped in a prefilter. For four YEARS my oil anaylsis comes back with a silicone reading of 2 ppm which matched exactly the stock paper filter and intake box. When I first switched to a cotton gauze filter I was worried, asked the lab tech at cat/finning and he said that 2 ppm silicone is the limit of what they can measure! I have got to say that KN filters allow for no error in cleaning and oiling. Very easy to dust a motor if not maintained correctly. Many guys have excellent oil analysis with KN filters...fact. The whole point I think I'm trying to make is a oiled filter does filter just as good as a paper filter and allows more airflow if maintained correctly. The biggest disaster in the making is the filter manufactures pawning off paper filters (Dry/Nano ) for our rigs that are easy to clean and last forever!!! Yah just shake and blow them out, good to go! Please!!!

 

red goat and cody459 is correct, cummins sw had a filter comparer set up that you could use and the results on oiled filters was evident in about 30 seconds of use, i have never seen any k&n or airaid filter that would not pass light around the stitches on the filter media, just hold it up to the sunlight or shine a bright light through it and see for yourself. and i have never seen a oil sample come back that did not have high silicon on the report just like the demo showed would happen.

 

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N.Johnson:

Good post Sir!

Like alot of the other Members here, I have been running "K&N Filters" in every Dodge CTD Pickup I have owned and that count is up to four (4) now,
those being, 1992, 1996, 2002 and my 2006. I have NEVER had one problem with these filters and have backed that up with regular oil sample testing on almost all of the trucks! As Mr. Johnson pointed out, the CORRECT oiling is very important on these filters and it is done INCORRECTLY by alot of owners!
And that is a fact! Like Mr. Johnson, my oil analysis numbers were almost exactly that of the paper filters and that also includes the areas of silicates and iron. The Members here will just have to make up their own minds on this.

Just my 2 cents.............................

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John_P