K&N extended life air filters

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Nov 14, 2021
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I tried searching for info on these with no luck so forgive me if they’ve been discussed. I’m not sure if they’re new but I don’t remember seeing them before. Of course we all know of the K&N reusable air filters but I didn’t know they offered a line of disposable air filters as well. They offer a “long life” filter which they list at 18k miles and an “extended life” listed at 24k miles. These are disposable oiled air filters.

Does anyone have any info on these? My first impression is that it seems well made. Made in China. Very very similar to the oiled STP premium air filters that I’ve been running,

IMG_0826.webp
 
Info?, I've none.
First impression? They're merely attempting to cash in on a name recognition.

As usual, 99.5% efficiency? ...at what particle size range?
 
They are probably fine, but they seem really overpriced for what what seems like a basic air filter.

"Up to 99.5% efficiency" seems good, but that figure would represent one of the most efficient models. K&N claims "up to 99% efficiency" for their washable filters, but a typical ISO test result for one of these filters is 97% initial / 98% average efficiency, and that's with coarse test dust, not fine dust.
 
~$35 for a run-of-the-mill looking oiled paper filter? No thanks, give me a Mann for half that.

If you look closely at the pic, you can see the holes 😁.
 
The OEM filter on my last 3 cars (2006 Toyota, 2017 & 2024 Hyundai) are rated for 30K miles.
That's extended enough for me.
I put a restriction gauge on the Toyota and it took 43K miles to reach 11 inches restriction on a full throttle run.
 
I don't get the 24k "extended life" when most cars recommend 30k mile filter changes. That is just marketing off the K&N name and selling a regular filter relabeled K&N. I would pass unless the price is good enough over other brands.
 
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They are probably fine, but they seem really overpriced for what what seems like a basic air filter.

"Up to 99.5% efficiency" seems good, but that figure would represent one of the most efficient models. K&N claims "up to 99% efficiency" for their washable filters, but a typical ISO test result for one of these filters is 97% initial / 98% average efficiency, and that's with coarse test dust, not fine dust.
Info?, I've none.
First impression? They're merely attempting to cash in on a name recognition.

As usual, 99.5% efficiency? ...at what particle size range?
If it's 99.5% on iso5011 that's very good.
A traditional k&n stops around 96%.
Any cheap no name paper air filter should stop around 97%.
A good paper air filter stops about 99%.
A very good air filter stops about 99.5%.
A great air filter stops greater than 99.9%.
That's iso5011 dirt rangeing in size from about 1 micron up to about 80 microns with most of the mass of the calibrated iso5011 dirt being in the 20 to 40 micron range.
 
If it's 99.5% on iso5011 that's very good.
A traditional k&n stops around 96%.
Any cheap no name paper air filter should stop around 97%.
A good paper air filter stops about 99%.
A very good air filter stops about 99.5%.
A great air filter stops greater than 99.9%.
That's iso5011 dirt rangeing in size from about 1 micron up to about 80 microns with most of the mass of the calibrated iso5011 dirt being in the 20 to 40 micron range.

Indeed it is:

IMG_0838.webp
Not planning on running this thing 24k. I switch my filters out yearly which works out to be about 6k miles.
 
Indeed it is:

View attachment 240332
Not planning on running this thing 24k. I switch my filters out yearly which works out to be about 6k miles.
Put a filter minder on there and change it when you get a slight restriction or when the foam starts to rip.
Last filter I replaced between 20,000 and 30,000 miles because the foam started to rip.
I've had the current air filter on my truck for about a year and 8,000 miles and still no trip on the 10 inches of water setting.
Also filters hit peak filtering efficiency when they are between 10 to 20% clogged.
 
A traditional k&n stops around 96%.
And yet they advertise them as "up to 99% efficiency* (*efficiency varies by application)". My point was that they probably use the same marketing tactic with these filters. A typical model might only be 98% efficient.
 
And yet they advertise them as "up to 99% efficiency* (*efficiency varies by application)". My point was that they probably use the same marketing tactic with these filters. A typical model might only be 98% efficient.
I'm not sure how how they came up with 99% on the traditional oiled cotton filters.
 
60-80k miles Air filter change. 1.5l Honda. Don’t live in a dusty environment. That’s about 4-5 years. It’s clear that filters efficiency improve with age, to a certain point. Most air filters are changed way to soon.
 
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