the k&n filter does get dirty quite quick but as long as u dont neglect it your golden.
Pros: reusable if maintained
Cons: gets dirty quickly
Vehicle:
Volkswagen
Reviews of K&N air filter
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907 votes
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K&N filters let in too much dirt when they get older & after a few washes following instructions you can see right through them. Then when oiled, dust plugs them up very fast. When over oiled, the oil can destroy the MAF. All in all not worth the $60 for a panel.
Cons: lets in dirt, plugs fast, oil damages MAF, not worth price
Vehicle:
Volkswagen
I didn't notice much of an increase in mileage since I did it almost immediately.
Cons: no mileage increase
K&N's work great, just don't over oil them. I've been running them for years on all my cars. No problem with the Touareg either in 10K miles.
Pros: work great, no problems
Vehicle:
Volkswagen Touareg
Mileage: 16093 km
The only thing im using is a KN Drop-In Filter and that's it.
Vehicle:
Volkswagen
basically the dirtier a paper filter gets the less it flows...not true for K&N
Pros: flow does not decrease
Vehicle:
Volkswagen Jetta
the paper filter is better for maybe the first 500 miles, after that the K&N breathes better and does not lose its air flow/filtration over time
Pros: breathes better, doesn't lose airflow
Vehicle:
Volkswagen Jetta
I use a k&n and I've noticed some grit mixed in with the oil that coats the walls of my intake track. I only clean it every 40k though.
Cons: grit in intake track
Vehicle:
Volkswagen
Mileage: 64374 km
the only advantage to the k&n is the reusability. for actual filtration, oem paper filters are better. power differences, on these cars, i dont think you will see any differences unless you are pushing over 325hp
Pros: reusability
Cons: worse filtration than oem
Vehicle:
Volkswagen
I've been using a K&N for a few weeks. I haven't noticed any power gains, but the throttle response feels slightly quicker (this could be in my head, but who cares, I'm happy). No difference in fuel economy.
Pros: quicker throttle response
Cons: no power gains, no fuel economy difference
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