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you cant see thru mine right now,thats for sure

now if you let it dry out I could see it not filtering very well

the oil is not gonna let any dust thru if it is kept properly oiled

read the box on theory of operation on how it works,it is to be oiled more often if it is in a real dusty service area and heat will dry it out

so it does need to be serviced from time to time




I encourage anyone running a K&N air filter to get a Used Oil Analysis done on your next oil change. If your air filter is not doing it’s job, you’ll see it in the motor oil.

Below, the comments of Certified Lubrication Specialist, George Morrison regarding air filtration.

Introduction: The late George Morrison, was a Certified Lubrication Specialist by the Society of Trobologists and Lubrication Engineers as well as the founder and CEO of AV Lubricants, one of the largest Exxon/Mobil distributors in the United States. During his 35 years in the lubricant industry, He worked with such industries as Aviation and Coal Mining assisting with their specific lubricant needs in which hundreds of Used Oil Analysis reports went through his hands a week. As a result, Mr. Morrison was an expert in lubricant and lubricant filtration.

Quotes by Mr. Morrison:

"From a lube engineer's perspective that looks at a hundred or so oil analysis results a day, I would highly recommend you or anyone running a K&N or other aftermarket air filter do an engine oil analysis to determine that the filter is indeed doing its job. I can easily spot a K&N equipped vehicle oil analysis results as in 90% of cases the filter keeps out bricks and birds very effectively but little else. The #1 cause of reduced engine life is dirt. The #1 engine oil alert I look at is dirt. One teaspoon of dirt will destroy a large V-16 CAT engine.. i.e. we need to make sure we have the best filter media, tightest induction system possible to ensure maximum engine life. If you look at a K&N filter you can see through the medium very easily. Supposedly the 'tackifier' grabs the incoming dirt particles. Visualize a dirt particle approaching the filter medium at 100+ MPH: there is NO oil, no tackifier that is going to reach out and capture that particle. Filter face impact velocity is just too great."

"Regarding the "easy 10 hp increase", I would be wary of the claim. A recent VW TDI dyno day revealed that the highest horsepower developed at the rear wheels was for a TDI equipped a paper, OEM equipped VW vs. the foam/paper/K&N, snorkled VW's."

"If you have single digit silicon and low wear metals with your oil analysis results, you are about as good as it gets! That is a general target for dirt: i.e. single digits. If you have this with spectro, you have excellent air filtration with no induction leaks. As for recommendations, I suggest name brand/OEM paper. If a person wants to try another, do an oil analysis with quality paper, then another oil analysis, with particle count, for the aftermarket. This will give a complete picture of exactly how the aftermarket is doing."

Summary: As stated above, Used Oil Analysis is the real world test which proves OR disproves the as advertised filter efficiency claims.

Source cited: Click HERE