Loud backfire

[FJmonkey]

I don't remember ever using oil on paper filters. They were always dry. They tend to flow quite well but at the cost of not filtering well.

[FJ_Hooligan]

Pat,
Do you mean cotton gauze filters like K&N?

[Pat Conlon]

Some paper filters need no oil and should remain dry, some paper filters are designed for and need oil , like K&N.

[FJ1100mjk]

Do you mean cotton gauze filters like K&N?

Exactly.

"The K&N air filter is somewhat more complex. The unique design features multiple layers of oiled cotton fabric"

K&N's Air Filter Facts

Funny how this thread has morphed into air filtration after being being started for "Loud backfire" 

[balky1]

Do you mean cotton gauze filters like K&N?

Exactly.

"The K&N air filter is somewhat more complex. The unique design features multiple layers of oiled cotton fabric"

K&N's Air Filter Facts

Funny how this thread has morphed into air filtration after being being started for "Loud backfire" 

Evolution at work. 

[ribbert]

Some paper filters need no oil and should remain dry, some paper filters are designed for and need oil , like K&N.

This thread just keeps digging a deeper hole, and we still don't know what the difference between foam filter oil in a bottle and foam filter oil in a spray can is except you shouldn't use the one in the bottle........



Noel

[Pat Conlon]

I have both filters, a K&N panel filter for my Miata and the UniPods for my FJ, so I can tell you the difference between the K&N filter oil and the foam filter oil.
The K&N filter oil is a lighter body oil, the foam filter oil (I use PJ1) has a heavier body and as Mark said, more tacky, more adhesive allowing the oil to stick better to the more porous foam.

K&N oil on foam does not stick and thus does not last long. Motor oil on foam does not stick (and can degrade the foam) Whether it's paper or foam, oil is most important for the filtering ability (excepting dry paper filters)
There are several discussions on the web which also share my conclusions if you care to search.
How come it seems any topic involving oil causes such confusion?

My point is simple: Follow the manufacturer's specifications. They know more than you do. They know what they designed their filters to use.
Foam filter oil is different than paper filter oil so use either appropriately.
http://www.uniflow.com.au/contents/en-us/d312.html

Your engine will thank you.

Noel, I've never seen foam filter oil in a bottle....I've always used a spray. In the past I've used the UNI, PJ1 and BelRay foam filter spray (oil)**.

 ** for Marty

[FJmonkey]

The foam filter oil does come in  can (bottle) UNI

[Pat Conlon]

Thanks Mark, I'll try that when my current can of PJ1 runs out. Looks to be a better deal at 16 oz vs 5.5 oz in the spray.

[FJ1100mjk]

The foam filter oil does come in  can (bottle) UNI

That's what I'm using for my UNI foam filter, that replaces the OEM filter used in the air box.

[ribbert]

How come it seems any topic involving oil causes such confusion?

Pat, the only confusion is continually referring to cotton gauze filters as "paper filters you oil". A number of people (5) have subtly made this point already, and yes, the oil for gauze is different from foam as you pointed out.
There are 3 types of material used in air filters, paper you oil is not one of them.

Noel, I've never seen foam filter oil in a bottle....

Pat, it's all I ever use, I think Uni even sell it by the bottle as do Motul, Belray, Castrol etc. Like anything in an aerosol, it's expensive by volume in a spray can.

I warm the oil by standing in a jug of hot water to thin it down, put the filter in a ziplock bag with the oil, work it well through, cut the corner off the bag (with it still sealed), squeeze the excess back into the bottle, remove the filter and squeeze it again in an absorbant rag then clean the flanges with whatever to remove oil so they don't slip off.

I never give them a final rinse in detergent and water before oiling. Unless you can be sure they are 100% dry, which is difficult to determine, the oil will trap the water and IMO, that can degrade the foam.

Noel

[Pat Conlon]

Oh...ok, got it...K&N is cotton gauze, not paper... My bad.

Good tip on the bottled UNI oil...