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STP Air Filter Efficiency #4754900
05/12/18 08:38 AM
05/12/18 08:38 AM
Joined: Apr 2013
Posts: 970
Colorado
JerryBob Offline OP
JerryBob  Offline OP
Joined: Apr 2013
Posts: 970
Colorado
I watched my cousin changing the air filter in his Jeep using an STP filter.

The box said 90% efficiency. That struck me as very low. Shouldn’t it be in the high 90s?

Re: STP Air Filter Efficiency [Re: JerryBob] #4754906
05/12/18 08:46 AM
05/12/18 08:46 AM
Joined: Dec 2006
Posts: 8,468
Illinois
mrsilv04 Offline
mrsilv04  Offline
Joined: Dec 2006
Posts: 8,468
Illinois
90% efficient at what? Filtering out gravel sized chunks? Unfortunately, there's not a lot to go on here.

However, this is likely a case of where your cousin got what he paid for... or less than he paid for.

I can buy a $3 oil filter, and see the spec is 99% at 30 microns... right on the box. For what I'm trying to accomplish, that's plenty good enough.

Air filters may not be as straight-forward.


2004 Silverado - on its 3rd Jasper engine in less than one year.
Re: STP Air Filter Efficiency [Re: JerryBob] #4754925
05/12/18 09:07 AM
05/12/18 09:07 AM
Joined: Dec 2016
Posts: 7,480
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,480
Waco, TX
Originally Posted By: JerryBob

The box said 90% efficiency. That struck me as very low. Shouldn’t it be in the high 90s?


Not enough information available to make an informed decision.


Yes, really.


"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: STP Air Filter Efficiency [Re: JerryBob] #4754985
05/12/18 10:24 AM
05/12/18 10:24 AM
Joined: Aug 2005
Posts: 4,563
NW Ohio
Jim Allen Offline
Jim Allen  Offline
Joined: Aug 2005
Posts: 4,563
NW Ohio
The only way to know is to query the manufacturer. That is an odd spec to list given that other manufacturers list higher numbers. It wouldn't be a horrible filter if it was a test made on find dust. That would equate to somewhere around 95+% on coarse (which is the more common spec listed. Nowaways, most mfrs list 98 percent on the coarse dust test and some at 99% (one percent counts for a LOT in an air filter and 4-5 percent is HUUUUUGE). 90% isn't much better than an oil bath filter and they suck (literally and figuratively).


Jim Allen
Keepin' the Good Old Days of Four Wheeling Alive
Re: STP Air Filter Efficiency [Re: JerryBob] #4755169
05/12/18 02:57 PM
05/12/18 02:57 PM
Joined: Dec 2015
Posts: 592
Arkansas
mazdamonky Offline
mazdamonky  Offline
Joined: Dec 2015
Posts: 592
Arkansas
Sadly, this number sounds not good to me, though we don't know what the 90% efficiency rating is for. Sadly, this is the only filter I can get locally for my 85 rx7. Everything else has to be ordered online and Fram has pretty much stopped making that filter so you can't get it anywhere.


2018 mazda3 hatch 2.5 263 miles
1985 rx7 1.1 98k miles
2002 protege 220k miles
1985 rx7 with a 5.0 swap
2002 Protege 299k miles Girlfriend's
4 more running cars in yard not mentioned
Re: STP Air Filter Efficiency [Re: mazdamonky] #4755501
05/12/18 11:57 PM
05/12/18 11:57 PM
Joined: Aug 2008
Posts: 2,250
Cali
Malo83 Offline
Malo83  Offline
Joined: Aug 2008
Posts: 2,250
Cali
I run 2 STP filters on my DD 83 Silverado with no problems, oil and air get them at AutoZone. thumbsup

Re: STP Air Filter Efficiency [Re: JerryBob] #4755548
05/13/18 03:44 AM
05/13/18 03:44 AM
Joined: Mar 2015
Posts: 5,602
Virginia
bbhero Offline
bbhero  Offline
Joined: Mar 2015
Posts: 5,602
Virginia
Yeah I saw that the other day in AZ. And I was like holy cow that is substandard.

I thought the back of the box should have read: "This air filter only catch large insects, hummingbirds, and large pieces of gravel. This air filter is not intended for the meaningful use of small particulate filtration".

Last edited by bbhero; 05/13/18 03:45 AM.

Nissan Altima 3.5 Coupe
Mobil Super 5w30 Wix 57356
"Treat your family like your friends and treat your friends like your family."
Re: STP Air Filter Efficiency [Re: JerryBob] #4770354
05/28/18 01:29 PM
05/28/18 01:29 PM
Joined: Oct 2016
Posts: 128
WV
jonnied1 Offline
jonnied1  Offline
Joined: Oct 2016
Posts: 128
WV
Purchased a STP filter for my 2008 Jeep Rubicon the other day. The rubber seal around the edge of the filter is not even secured to the filter media. Pulled the seal loose removing the filter from the box. Took it back and purchased a Purolator filter.
The STP is a very poor quality build as far as I am concerned!


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