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To oil or not oil OPE foam pre-filters #5135207
06/15/19 07:54 PM
06/15/19 07:54 PM
Joined: Mar 2004
Posts: 1,775
Flaherty, KY
92saturnsl2 Offline OP
92saturnsl2  Offline OP

Joined: Mar 2004
Posts: 1,775
Flaherty, KY
Most of my OPE has a air filter with a foam pre-filter element that goes around or on top of it. This includes my Echo trimmer, two Kohler Command V-twins, Briggs 900-series on my tiller, and a couple others.

In the past I have always squeezed some oil into the filter (usually using MMO or something light viscosity that spreads evenly) before installing it. But I've also noticed that when doing this, the pre-filters get gummed up with crap quickly, I can't even get a mowing season out of them before having to replace or clean the pre-filter. Hard to clean all the gunk out and for the price they usually just get replaced.

Is there any benefit to oiling the pre-filter, or should I just let it be? What do you guys do?


1985 F-250HD 7.5L 4x4 135k- Castrol GTX 15w-40
04 Odyssey EX 190k Valv. Durablend 5w-30
96 Maxima GLE 265k Chevron Delo LE 5w-40
07 Chrysler Pacifica Limited 4.0L 140k Belgian Castrol Edge 0w-30 Euro
Re: To oil or not oil OPE foam pre-filters [Re: 92saturnsl2] #5135265
06/15/19 08:56 PM
06/15/19 08:56 PM
Joined: Jun 2003
Posts: 19,177
Apple Valley, California
Chris142 Offline
Chris142  Offline

Joined: Jun 2003
Posts: 19,177
Apple Valley, California
Afik foam filters are oiled.


02 Wrangler traveler sae30
87 F250 Valvoline 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor Chevron sae30
Re: To oil or not oil OPE foam pre-filters [Re: 92saturnsl2] #5135272
06/15/19 08:59 PM
06/15/19 08:59 PM
Joined: Jun 2012
Posts: 2,071
High Tax Illinois
oldhp Offline
oldhp  Offline

Joined: Jun 2012
Posts: 2,071
High Tax Illinois
Isn't that the purpose of the pre-filter? I would just keep it oiled as you have been doing. Otherwise your regular filters are going to get dirty faster. I put the filter under water and squeeze Dawn into it. I keep squeezing and rinsing until it rinses clean water. When dry, I've used everything from engine oil to WD-40, doesn't seem to make a difference.


2018 RAM 1500 3.6/8 speed.
2019 Dodge Charger SXT 3.6/8 speed.
"When others cut you down, remember where they came from."
"I don't run...........I just wait."
Re: To oil or not oil OPE foam pre-filters [Re: 92saturnsl2] #5135275
06/15/19 09:01 PM
06/15/19 09:01 PM
Joined: Jun 2017
Posts: 340
New Hampshire USA
Dinoburner Offline
Dinoburner  Offline

Joined: Jun 2017
Posts: 340
New Hampshire USA
Leaving the pre filter dry allows for better air flow longer but of coarse fills the secondary quicker with the finer particles. We keep the pre clean and change both yearly.


77 Chev stepside 454 Casteroil syn
95 GMC 4wd mobil syn
2016 Equinox LTZ V6 dealer
Kubota L5030 T6
Re: To oil or not oil OPE foam pre-filters [Re: 92saturnsl2] #5135424
06/16/19 04:06 AM
06/16/19 04:06 AM
Joined: Dec 2016
Posts: 9,119
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 9,119
Waco, TX
I always oil mine very lightly... a little goes a long way

Just dawn dish soap and water cleans them up fine. Don't try to get it 100% clean again - that's fruitless.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: To oil or not oil OPE foam pre-filters [Re: 92saturnsl2] #5135555
06/16/19 08:54 AM
06/16/19 08:54 AM
Joined: Apr 2015
Posts: 333
T-County, Ohio
AnthemBassMan Offline
AnthemBassMan  Offline

Joined: Apr 2015
Posts: 333
T-County, Ohio
My Mother-in-law’s John Deere x475 tractor manual says NOT to oil the foam ore-filter. But I do oil the don filters on my Lawn Boys and weed eater. Also on the usual Briggs vertical mower engines.

L8R,
Matt


2010 Chrysler Sebring Touring 185k miles
Harvest King 5w20 synthetic/Prime Guard filter

2017 Hyundai Elantra SE 35k miles
Quaker State Ultimate Durability 5w30/Fram Ultra filter
Re: To oil or not oil OPE foam pre-filters [Re: 92saturnsl2] #5135561
06/16/19 09:01 AM
06/16/19 09:01 AM
Joined: Aug 2010
Posts: 6,550
Champlain/Hudson Valley
Kira Offline
Kira  Offline

Joined: Aug 2010
Posts: 6,550
Champlain/Hudson Valley
Running water and repeatedly squeezing Dawn dishwashing liquid through it.....

DON'T DO IT IF YOU HAVE A SEPTIC SYSTEM.

For the waste made, it mightn't be a good idea for municipal sewage systems either. Why tax the devil out of them?

Re: To oil or not oil OPE foam pre-filters [Re: AnthemBassMan] #5135644
06/16/19 11:12 AM
06/16/19 11:12 AM
Joined: Jan 2015
Posts: 1,169
missouri
ragtoplvr Offline
ragtoplvr  Offline

Joined: Jan 2015
Posts: 1,169
missouri
Originally Posted by AnthemBassMan
My Mother-in-law’s John Deere x475 tractor manual says NOT to oil the foam ore-filter. But I do oil the don filters on my Lawn Boys and weed eater. Also on the usual Briggs vertical mower engines.

L8R,
Matt

There is enough spit back before the reeds close that a lawboy filter is automatically oiled.

Rod

Re: To oil or not oil OPE foam pre-filters [Re: 92saturnsl2] #5135685
06/16/19 12:05 PM
06/16/19 12:05 PM
Joined: May 2006
Posts: 4,132
Central Wisconsin
dwendt44 Offline
dwendt44  Offline

Joined: May 2006
Posts: 4,132
Central Wisconsin
Quote
My Mother-in-law’s John Deere x475 tractor manual says NOT to oil the foam ore-filter.


Perhaps because some folks overdo the oil and it drips onto the paper filter element below, causing
it to deteriorate.

I lightly spray the foam with WD-40 let it air dry for a bit before re-installing the foam pre-filter.


My 2¢


There's no such thing as:
Too big of a battery,
Too large of a gas tank,
or too loud of a horn,
or too bright headlights.
Re: To oil or not oil OPE foam pre-filters [Re: 92saturnsl2] #5136226
06/17/19 12:02 AM
06/17/19 12:02 AM
Joined: May 2007
Posts: 2,163
West Michigan
HM12460 Offline
HM12460  Offline

Joined: May 2007
Posts: 2,163
West Michigan
I oil mine lightly and squeeze out the excess. They clean well with some hot water and Dawn dish soap.



2018 Chevy Colorado
1995 Ford Thunderbird



Re: To oil or not oil OPE foam pre-filters [Re: 92saturnsl2] #5136386
06/17/19 08:41 AM
06/17/19 08:41 AM
Joined: Feb 2007
Posts: 3,958
Southeast
meep Online content
meep  Online Content

Joined: Feb 2007
Posts: 3,958
Southeast
I'd oil it unless the manual says not to. If I didn't have a manual, I'd oil it but would take extra care to make sure it was light and not heavy.


2018 F150
2015 crv (wifey!)
Re: To oil or not oil OPE foam pre-filters [Re: 92saturnsl2] #5136851
06/17/19 05:27 PM
06/17/19 05:27 PM
Joined: Jan 2008
Posts: 447
WV
bchannell Offline
bchannell  Offline

Joined: Jan 2008
Posts: 447
WV
I used to oil the pre-filter on my JD 425, but lately have been just cleaning and using it dry. It still catches the boulders headed into the filter, and doesn't clog up so fast. I have to clean it out a little bit sooner, but it's a whole lot easier. I've had some trouble with the filter clogging up and the tractor running rich, so I made the switch. I also hear that JD and Kubota has changed their minds on the issue and now recommend not oiling so I'm ok with that.

Re: To oil or not oil OPE foam pre-filters [Re: 92saturnsl2] #5138405
06/19/19 12:44 PM
06/19/19 12:44 PM
Joined: Dec 2011
Posts: 16
South Dakota
Clayslayer Offline
Clayslayer  Offline

Joined: Dec 2011
Posts: 16
South Dakota
I always oil foam filters. I bought a quart of TwinAir filter oil several years ago for the UNI filter in my ATV. I don't think my grandchildren will ever finish off that quart of oil.... little goes a long way. For what it's worth: I put the filter in a zip lock bag, pour in a little oil, then squish the filter around until it's all the same color and adding oil if needed. Filter oil is....sticky. Very sticky. K&N filter oil works well too. Same stuff really...just red instead of blue.

Re: To oil or not oil OPE foam pre-filters [Re: 92saturnsl2] #5140950
06/22/19 01:38 PM
06/22/19 01:38 PM
Joined: Jan 2019
Posts: 22
Louisiana
nomas Offline
nomas  Offline

Joined: Jan 2019
Posts: 22
Louisiana
My Kohler engine on my Bad Boy mower has a foam prefilter . I never even checked the manual , I just wash and oil it every couple of mowings . It's pretty dirty which shows it's doing it's job .

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