Recent Topics
This summers common ac repairs.
by Chris142
08/15/18 10:48 PM
Food for cats with kidney disease.
by montero1
08/15/18 09:23 PM
Land pride 5615 rotary cutter gearbox oil?
by Jmoney7269
08/15/18 09:20 PM
Are these factory Ford lug nuts pure garbage?
by Blaze
08/15/18 09:15 PM
Amsoil Signature vs OE?
by buck91
08/15/18 09:02 PM
Chev Trailblazer thermostat replacement
by BrianF
08/15/18 07:37 PM
Stabil Ethanol treatment
by mjk
08/15/18 07:01 PM
Windows Update Strategy?
by MONKEYMAN
08/15/18 06:49 PM
Motorcraft PCMO reformulation
by LotI
08/15/18 06:45 PM
Front rotor recomendations - 1993 F-150 4x4
by BrocLuno
08/15/18 06:07 PM
Premium Gas Prices
by Zee09
08/15/18 05:47 PM
Electrical Problem
by dishdude
08/15/18 05:47 PM
Remove tape adhesive from upholstery
by Walmill
08/15/18 05:37 PM
Subaru Legacy 2.5 review
by Cujet
08/15/18 05:11 PM
Steve Perry has a new song out
by Jimmy9190
08/15/18 04:51 PM
Idemitsu 0w20 5 QT for $15.73
by dmiko
08/15/18 04:47 PM
Valvoline Advanced Synthetic (SynPower) 12K OCI - Ford 2.5L
by dogememe
08/15/18 04:22 PM
Tire Date Code
by Building3
08/15/18 03:53 PM
Bridgestone Dueler - Great tire
by StevieC
08/15/18 01:39 PM
Corvette 5.7L LT-1 Engine. M1 0w-40?
by JosephH1
08/15/18 01:24 PM
Newest Members
RockerSwitches, Jmoney7269, Charly_gt, tryamu, Twizzler
65721 Registered Users
Who's Online
59 registered (1JZ_E46, 01rangerxl, Artem, 1.8Tango, Astro14, ag_ghost, 4 invisible), 1124 Guests and 32 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65721 Members
67 Forums
288781 Topics
4816570 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#4754900 - 05/12/18 09:38 AM STP Air Filter Efficiency
JerryBob Offline


Registered: 04/11/13
Posts: 939
Loc: 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?
_________________________
Certified Filter Cutter - License #F-23567 Expires 12/2019

Top
#4754906 - 05/12/18 09:46 AM Re: STP Air Filter Efficiency [Re: JerryBob]
mrsilv04 Offline


Registered: 12/08/06
Posts: 8326
Loc: 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.

Top
#4754925 - 05/12/18 10:07 AM Re: STP Air Filter Efficiency [Re: JerryBob]
Linctex Offline


Registered: 12/31/16
Posts: 6189
Loc: 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."

Top
#4754985 - 05/12/18 11:24 AM Re: STP Air Filter Efficiency [Re: JerryBob]
Jim Allen Offline


Registered: 08/12/05
Posts: 4563
Loc: 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

Top
#4755169 - 05/12/18 03:57 PM Re: STP Air Filter Efficiency [Re: JerryBob]
mazdamonky Offline


Registered: 12/08/15
Posts: 562
Loc: 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.
_________________________
1985 rx7 1.1 98k miles
2002 protege 220k miles
1985 rx7 with a 5.0 swap
2002 Protege 292k miles Girlfriend's
4 more running cars in yard not mentioned

Top
#4755501 - 05/13/18 12:57 AM Re: STP Air Filter Efficiency [Re: mazdamonky]
Malo83 Offline


Registered: 08/08/08
Posts: 2067
Loc: Cali
I run 2 STP filters on my DD 83 Silverado with no problems, oil and air get them at AutoZone. thumbsup

Top
#4755548 - 05/13/18 04:44 AM Re: STP Air Filter Efficiency [Re: JerryBob]
bbhero Offline


Registered: 03/20/15
Posts: 4812
Loc: 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".


Edited by bbhero (05/13/18 04:45 AM)
_________________________
Nissan Altima 3.5 Coupe
Quaker State High Mileage 5w30 Purolator Boss 14610
"Treat your family like your friends and treat your friends like your family."

Top
#4770354 - 05/28/18 02:29 PM Re: STP Air Filter Efficiency [Re: JerryBob]
jonnied1 Offline


Registered: 10/16/16
Posts: 128
Loc: 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!

Top