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The Lab test results come as no surprise to me.
I was over the 'small' ( 2 ton & smaller trucks, air compressors of 375 & less cfm, welders, etc.) equipment division @ United Rentals for close to 15 years and found out (the hard & expensive way) not to run K&N's on PowerStroke Ford trucks.
The flow required with these units far exceeded the filter's ability to handle it, resulting in 'dusted' engines.
The decision to use them came from the 'bean counters' up front because I was going thru filters about every oil change (5k or so...) at a cost of aprox $130.00 each vs. the 'reusable' K&N's at about the same price.
A couple of $6k+ motors changed their minds quickly after that.
I currently use a K&N because my o.e. was wet & failed. The bike is my main transportation so waiting 4~6 days to get here was not a option at that time & it was better than nothing...
It was available locally and only cost me $6.00 more than the (now defunct) dealership wanted for a o.e. unit.
As a side note, I could not detect any performance difference.
I have used HiFlow filters in the past with fully satisfactory results. Next service interval I will most likely order one & install it. They appear to be a good 'bang for the buck' value & as far as I've seen the same quality as the o.e..
If Purolater made an air filter I would give it a shot. I have changed the o.f. to one w/ the adapter& like the results.
 

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I have used K&N’s for years with no ‘dusted’ engines. Oil analysis shows very little dirt in the oil. Use what you want.


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How much is very little dirt?

Install an OEM filter then have another oil analysis done to see if the "very little dirt" is less.
 

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I too, put a K&N in my 650 when it had 6,000 miles on it. It now has 65,000, doesn't use oil and it still has same K&N filter in it. It works for me.
 

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I don't think anyone is saying if you use a oiled gauze filter your motor is in eminent danger of failure because of particulate infiltration especially at low miles. I'd certainly not consider "high mileage" being 65,000 miles on any modern engine.

I also don't think anyone is saying oiled gauze filters, filter to a higher micron level vs pleated paper. Oiled gauze filters are like a kitchen colander (high flow low filtration) and pleated paper filter are like coffee filters (low flow high filtration). Pour wet coffee grounds in to both and one will drain faster but filter less and the other will filter more but drain slower.
 

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What I'm saying is "why bother with K&N filters?" There's no performance advantage, and unless you rack up mileage at an incredible rate, the cost savings are minimal, and they arguably don't filter as well, although I'm not sure the minimal amount of "dust" that we're talking about here will have any real effect on the lifespan of a typical motorcycle. I'm talking about on a street bike, in normal operating conditions. Could be a different story if you operate in very dusty conditions regularly, though that's also where I would want the superior filtering ability of the pleated paper filters.
 

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What I'm saying is "why bother with K&N filters?" There's no performance advantage, and unless you rack up mileage at an incredible rate, the cost savings are minimal, and they arguably don't filter as well,
Agreed. Also the time it takes to clean, dry and oil a gauze filter I could have a 1,000 miles on an OEM filter.
 

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I use K&N, have had no issues in off road or highway use. Do note that they make 2 filters, one for "race" use and the other for street use. The race does allow a bit more flow, not what I wanted for my Strom. Do not over oil them!
10-4 on don't over oil.
 

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I tried a HiFiltroPro filter this last time around, just for giggles.

I'm due for an oil change in not too long. Maybe I'll get the oil analyzed, just for giggles.

Doubt I'll see any difference. Vs. a Suzuki filter, the HiFiltroPro looks pretty much the same. Media is red rather than white, and there's a slightly different arrangement of the paper supporting structure.
 

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I look at it as saving resources. Less trash(air filters). I also have done oil analysis to find out how long I can run my motor oil.


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I don't thinks its that simple. Paper element may actually be far easier on the environment that a pleated gauze type. A gauze element need to be washed with water and detergent. This creates waste water that need to be treated then the filter needs re-oiled that had to be extracted and refined.

Kind of like how people like how Prius cars have a small carbon footprint until you account for the manufacture and disposal of the batteries. Then the lines are a lot more blurred n wht is more environmentally f
riendly

Sometimes more is less.
 

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I use OEM filters on my bikes and cars/trucks. They are easy to grab from Amazon (need to plan ahead) or bite the bullet and get from dealer. OEM air and oil filters are just too easy to obtain and use.

I quit using K&N airflow filter chargers (or what ever they are calling them now) years ago. I don't trust the oil in the filter not going downstream. I have no data and the interwebs are full of opinions...just like mine.
 

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I don't thinks its that simple. Paper element may actually be far easier on the environment that a pleated gauze type. A gauze element need to be washed with water and detergent. This creates waste water that need to be treated then the filter needs re-oiled that had to be extracted and refined.

Kind of like how people like how Prius cars have a small carbon footprint until you account for the manufacture and disposal of the batteries. Then the lines are a lot more blurred n wht is more environmentally f
riendly

Sometimes more is less.
But you have no proof of your theory and neither do I. I'm pretty sure the extended oil change thing works though.
 

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Blowing out paper filters is a life extender to get out more of that dust than tapping (gently) doesn't shift. However it is crucial that you don't apply high air pressure as you will blow microscopic tunnels through the paper that will eventually lead to a dusted engine. The intake suck from the engine generates a HUGE amount less air pressure on the dirty side than a compressor air nozzle.
15-20 lbs is more than enough to do the job and never put the nozzle against the filter element.
 
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