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And K&N says to clean and re-oil the outside of their air filters every 50,000 miles.  They also say to use the aerosol oil spray very sparingly.

I realize that may not be practical for this crowd, but I typically go three years between air filter cleanings and never had a problem, although I don’t have EFI or a MAF sensor to worry about.

Also remember that K&N filters increase in filter rate as they collect more dust.  Cleaning them too often is counter-productive.

Last edited by Gordon Nichols

Actually, I never oil the inside just the outside, and as per my tech, a little is all you need not a lot. 

FYI, I did have both my tranny axel seals changed on my subie tranny at the beginning of last season, as they were leaking,  so it may have contributed to the K&N as it splashes all over the place and with the open engine to the ground it may be the reason I had to clean them more often while AC's are closed up. 

I also had to clean the whole underneath the tranny lube was all over the place.

 

Update... I re-read the post and honestly I never heard of anyone coating the inside but who knows anything can happen. 

Last edited by IaM-Ray
IaM-Ray posted:

Actually, I never oil the inside just the outside, and as per my tech, a little is all you need not a lot. 

FYI, I did have both my tranny axel seals changed on my subie tranny at the beginning of last season, as they were leaking,  so it may have contributed to the K&N as it splashes all over the place and with the open engine to the ground it may be the reason I had to clean them more often while AC's are closed up. 

I also had to clean the whole underneath the tranny lube was all over the place.

 

Update... I re-read the post and honestly I never heard of anyone coating the inside but who knows anything can happen. 

When talking about your tranny whining you have to be careful. Maybe the tranny was whining because you didn't lube your tranny properly prior to using it.

IaM-Ray posted:

Spraying the unit off the car with just a bit of a film of oil is all that is needed JMM.

That's what I do. The previous owner of my old, now departed V70R, oiled it like he was making garlic bread. The fact that it ran like crap from the oily MAF was part of how I got a screaming deal on it. I threw a paper filter in, spritzed the MAF wire with cleaner and it was fine. A through cleaning of the K&N before putting it in at the next filter change resulted in 100,000 miles and 4 years of trouble free running. 

Gordon Nichols posted:

And K&N says to clean and re-oil the outside of their air filters every 50,000 miles.  They also say to use the aerosol oil spray very sparingly.

I realize that may not be practical for this crowd, but I typically go three years between air filter cleanings and never had a problem, although I don’t have EFI or a MAF sensor to worry about.

Also remember that K&N filters increase in filter rate as they collect more dust.  Cleaning them too often is counter-productive.

I clean mine every couple years, about the same as brake fluid change intervals. Black and dirty is the way they work.

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