I bought a K&N filter for my car 10 months ago and am finally getting around to washing it. The K&N stock cleaning fluid has a familiar smell to it but I cannot remember fimiliar to what? I was wondering what else can be used to safely wash their filters. I was thinking something like Simple Green. I would like to know what other K&N filter users are using to clean their filters?

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84 300D, 82 Volvo 244Gl Diesel

Before I threw my K&N away (it got oil all over and thus damaged an intake air sensor in my last gasser), I washed it in "409." I suggest that you do the same.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

I dipped mine in a bath of kerosene. I don't know all the pros or cons of this method, but it worked well for me in a pinch. I believe the risk is that the filter is so clean, it is not trapping any particulates. K&N makes an oil spray that is supposed to help the effectiveness of their filters. I read about it on their website, but when I inquired about it at my local auto parts store, which carries a large selection of K&N filters, I found that they do not carry it. The clerk did not seem to think it was necessary. Of course, this is just one opinion and maybe not a very well informed one.

The K&N came with my car and I was exploring around to find why oil was leaking out of the bottom of my air cleaner housing. It appeared to me that the engine was starved for air because of the dirty air filter and was sucking air along with oil up through the return tube that travels down to the crankcase. After cleaning the filter and changing the oil, the problem went away. It could also have been due to a dirty check valve at the base of the tube which corrected itself after I changed the oil. But that is a whole different topic. If you are interested, Dave Morrison wrote up an excellent DIY article on replacing the check valve.

My car performed significantly better after I cleaned the filter, as it was soaked with oil and preventing air from flowing freely through.

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85 300D 75K Anthracite Grey 0-60 in 13 seconds **For Sale**
84 300D 333K Black (The Velveteen Rabbit) 0-60 in 14 seconds
00 Toyota Sienna 208K (Sold)
15 Subaru Outback 43K
11 Subaru Outback 67K
98 Ford Taurus 100K (Gertie - Was Grandma's - drove it to church and shopping - really) Daughter's car now.
30 Model A Ford 2 Door Sedan (Sold) 0-60 in . . . Never reached 60

K&N makes a recharge kit that includes the correct cleaner and oil. I can't see how using some other product to clean it makes sense. It is possible that another cleaner will strip too much of the filter oil out or impede the adhesion of the new oil. Same goes for the oil. IIRC, the K&N oil is animal/vegetable and not petroleum at all? The oil is specific, very tacky and dyed. The whole point of a K&N is that it be wet enough with oil that it catches the debris, dirt, etc. I soak mine until they drip, the wetter the better. As with other things in life....

RT

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When all else fails, vote from the rooftops!
84' Mercedes Benz 300D Anthracite/black, 171K
03' Volkswagen Jetta TDI blue/black, 93K
93' Chevrolet C2500HD ExCab 6.5TD, Two-tone blue, 252K

RT: This sounds like good advice. I think I need to look further for that kit.

Richard

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85 300D 75K Anthracite Grey 0-60 in 13 seconds **For Sale**
84 300D 333K Black (The Velveteen Rabbit) 0-60 in 14 seconds
00 Toyota Sienna 208K (Sold)
15 Subaru Outback 43K
11 Subaru Outback 67K
98 Ford Taurus 100K (Gertie - Was Grandma's - drove it to church and shopping - really) Daughter's car now.
30 Model A Ford 2 Door Sedan (Sold) 0-60 in . . . Never reached 60

See post #3.

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83 SD

84 CD

I have seen the add flash at the top of the page of this forum it may be that Fastlane or one of our other sponsers have the recharge kits; Krangen (partamerica) has them, the local Autozone sells the filters buy you have to order the oil/cleaner kit (which I have). I believe both sell the recharge oil in 1qt or 1gallon bottles also without the sprayer.

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84 300D, 82 Volvo 244Gl Diesel

I was thinking that when my cleaner in the kit has run out I would clean the filter with something else but buy the K&N oil for rechargeing it.

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84 300D, 82 Volvo 244Gl Diesel

I do not think I have this check valve on my 300D. They say the filter element is made of cotton so I do not thine Karosene would hurt the element. The rubber part; who knows. They do say not to over oil the filter and like any filter it can get plugged from use. Sound like the PO never cleaned it.

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84 300D, 82 Volvo 244Gl Diesel

I had one for the jeep, bought the recharge kit, too. Got one for the MB, new in box.
This is the only item listed in contents.

Attached Thumbnails

   

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83 SD

84 CD

The danger of washing improperly is shrinking the cotton element, not over-cleaning.

Correct! I have been selling K&N filters for almost 15 years and seen some people do some really retarded stuff to them. The holes in the cotton are of a certain size as to facilitate the use of the oil that is designed for it that closes the holes in the filter down to the correct micron size. If you clean it with the wrong stuff you will damage the element. If you use the wrong oil it will not function correctly. DO IT RIGHT! Buy the filtercharger kit and READ THE DIRECTIONS!

In addition, if you have replaced the stock "cold air intake" with a K&N cone type filter you are now sucking in HOT air from inside the engine compartment. Hotter air is less dense. Less dense air will provide lower performance, aside from the argument about the particulate size. This application will not be an improvement.

I just dunk it in a 5 gallon bucket of hot sudsy water and let it sun dry. Then spray a coating of light oil.

As of April I will have had the K&N filter for 5 years and have put on about 30kmi on the 328kmi 617 turbo.
It still starts at 15 degrees with as little as 1 second of glow and has gobs of top end power, relatively speaking.

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83 300D 328k mi (623) Light Ivory - daily driver
82 300D 166k mi (881) Thisle Green - fixer upper
82 300D 282k mi (473) Champagne - parts

What are you using in the sudsy water? Detergent, dish soap?

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84 300D, 82 Volvo 244Gl Diesel