Why not K & N filters by manufactures?

Question

If K & N filters increase the performance and economy of the engine, why not by manufactures?

Answer 1

Cause they are crap LOL. I mean filters, not manufacturers.

They might give you a slight increase in full throttle high rpm hp at the expense of higher noise and probably worse filtering. All talks about fuel economy are bs, if anything it will be worse.

Answer 2

All OEM and standard replacement air and oil filters are rated at a micro inch filtering ability. If K&N filters could stop the same sized dust and dirt particles as the standard filters all automobile companies would all make their own in a minute. As it stands now GM will back out of their warranty if the dealerships find a replacement gause / oil filter of any brand on a new car thats under warranty.
If you've ever looked through a new K&N at the sun you will see many empty spots. There's no filtration there at all. Fine dust and dirt will pass straight through.

Personaly I have a K&N on a Mercury Sable with the 24 valve motor. It went on when I purchased the car with 28,000 miles. Today the motor has 132,000 miles. I faithfully change the oil every 3-4 months and the motor has never used a drop between 3, - 3,500 mile oil changes. My theory is cylinder wall abrasion has been non -existant. The air filter must be doing it's job. I clean and re-oil it yearly.

To add a little note. At Toyota dealerships they sell an optional air filter. It's called a TRO Performance Air Filter. On the outside front of the box says: High Flow-Low Restance. To look at it it's a copy of a K&N to a T. Filter service is exactly like a K&N.

Answer 3

I agree but such a a manufacturer of there auto's will say most of them say such filters void warranties. I also feel they want you back buying a new filter instead of cleaning and a very slight mist of oil note never over oil any aftermarket filter. There is also one more thing to keep in mind if buying a open element air cleaner make sure they have a OE number listed. Which is executive order number and note it says note no emissions equipment is bypassed.

Answer 4

because car makers are into keeping their cars around and not having to pay a lot through warrenties to replace engines. Think about it, more air flow = less filtering, there is no way around it. You let more dirt into your engine with a K&N. Over a long time, think 100,000 miles, it starts to add up.

Answer 5

I like K&N filters they probably don't use them because they cost too much.

Answer 6

they cost more to make and make more noise.may see in the future to gain 1/10 of mpg.