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Filter Bypass Pressure... Why doesn't this matter? #5340721 02/04/20 11:10 AM
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ad244 Offline OP
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Hey BITOGers,

I've got a question that ive been wrestling with lately. If an incorrect filter is used with the incorrect bypass pressure, wouldn't that potentially allow unfiltered oil to circulate the engine? If my Toyota specs a filter that has a 20 lb bypass spring but I use a filter with a 10 lb bypass spring, wouldn't that defeat the filtration? Or am I not understanding this correctly?

And if so, why is this not a thing we actively worry about?

Re: Filter Bypass Pressure... Why doesn't this matter? [Re: ad244] #5340736 02/04/20 11:32 AM
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It does matter, but in testing done here by member Jim Allen years ago, it's not as big a deal as one thinks, except in very low temperatures & high viscosity oils. Some GM & Subaru filters need that 20+ PSI bypass, though!


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Re: Filter Bypass Pressure... Why doesn't this matter? [Re: ad244] #5340740 02/04/20 11:36 AM
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The bypass is a pressure differential across a plugged filter. A clean(er) filter will have the same engine oil pressure on both sides of the filter. As it plugs up or with very thick oil the bypass will open @ the set pressure. Remember that the engine bearings are what makes the pump build pressure to pump through. Not the filter.


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Re: Filter Bypass Pressure... Why doesn't this matter? [Re: ad244] #5340778 02/04/20 12:09 PM
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A filter that is not plugged the odds of the bypass opening is low, and most oil will still flow thru the filter. Filtered oil in the sump is already pretty clean, so there are few particles large enough to cause damage to begin with. Then said particle would have to be in the unfiltered fraction of the oil flow and go to a critical area. Avoiding higher RPM even when the engine is cold reduces the chance the filter will bypass. In the old carburetor days, fast idle used to be up to 2K RPM in some cases, and you might have to rev it higher a few times to keep it running. Odds of a filter bypass was higher then. The fuel injection motors seldom exceed 1200 RPM at idle when cold. If you start and drive off in the cold, if you try to keep minimum throttle opening in the first few minutes the bypass should not open. If you are like my neighbor, and start up, back out and then gun it cause he is going to be late to work, again. Yes, you might open the bypass. I would imagine most filters never bypass.

Re: Filter Bypass Pressure... Why doesn't this matter? [Re: ad244] #5340782 02/04/20 12:11 PM
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ad244 Offline OP
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Thanks for the explanation guys

Re: Filter Bypass Pressure... Why doesn't this matter? [Re: ad244] #5340787 02/04/20 12:18 PM
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This is one reason I only use OEM filters on my cars and OPE.


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Re: Filter Bypass Pressure... Why doesn't this matter? [Re: Gebo] #5340809 02/04/20 12:46 PM
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But if I get an aftermarket filter that is specified for my engine, then why worry? If the filter manufacturer is doing more than just matching the threads, they are making sure that the filter does meet the OEM specs for bypass, also, aren't they?

Originally Posted by Gebo
This is one reason I only use OEM filters on my cars and OPE.


Originally Posted by ad244
And if so, why is this not a thing we actively worry about?

Last edited by paulri; 02/04/20 12:46 PM.

2005 Toyota Sienna LE; 171,000 miles
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Re: Filter Bypass Pressure... Why doesn't this matter? [Re: paulri] #5340829 02/04/20 01:20 PM
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ad244 Offline OP
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Originally Posted by paulri
But if I get an aftermarket filter that is specified for my engine, then why worry? If the filter manufacturer is doing more than just matching the threads, they are making sure that the filter does meet the OEM specs for bypass, also, aren't they?

Originally Posted by Gebo
This is one reason I only use OEM filters on my cars and OPE.


Originally Posted by ad244
And if so, why is this not a thing we actively worry about?


I'd say a good portion of the time we dont know the filters that we use are actually spec'd for our engine. Just that they install correctly. The pressure could be different was my concern.

Re: Filter Bypass Pressure... Why doesn't this matter? [Re: ad244] #5340843 02/04/20 01:40 PM
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Re: Filter Bypass Pressure... Why doesn't this matter? [Re: ad244] #5340846 02/04/20 01:46 PM
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The Fram spec'd for my Jetta is 12 PSI. The oem one is 36 PSI. No way would I put a 3x different filter on my car.


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Re: Filter Bypass Pressure... Why doesn't this matter? [Re: ad244] #5340855 02/04/20 01:57 PM
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Subaru specs a high 23 psi for their oil filters. Fram does not make a Subaru specific Ultra filter for the Subaru, but lists the generic Asian fit 6607 or 7317, with a 13 psi by-pass.

Why would a large corporation list a lower psi by-pass filter for that application if there was any chance of damage to the engine as a result ? Answer ... there is no chance of engine damage. The lower psi by-pass simply opens slightly earlier, and slightly more frequently, than the higher psi valve. Meaning your oil gets fully filtered 96 % of the time, versus 98% of the time with the higher by-pass.

On cold winter days, with cold thick oil, ALL filters by-pass for at least a few minutes. It doesn't seem to hurt anything.


Last edited by geeman789; 02/04/20 01:58 PM.

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Re: Filter Bypass Pressure... Why doesn't this matter? [Re: ad244] #5340872 02/04/20 02:17 PM
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paulri Online Content
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From one website (http://oilfilterdata.com/index.php), i just found that the Fram EG3614 that fits both engines in my sig, is 12 PSI bypass. The Wix equivalent is 8-11. I could not find the Toyota oem filter specs.

Thanks for bringing this up--one more thing for us to obsess on cool

I would hope that the aftermarket filter companies would give us a filter that is similar to the OEM specs, although as you said we just don't know (unless the specs are published).

Does anyone know of Toyota OEM filter bypass pressure? My filter is the 90915-YZZD1.

Originally Posted by ad244
I'd say a good portion of the time we dont know the filters that we use are actually spec'd for our engine. Just that they install correctly. The pressure could be different was my concern.


2005 Toyota Sienna LE; 171,000 miles
2006 Toyota Highlander Hybrid 136,000 miles
Re: Filter Bypass Pressure... Why doesn't this matter? [Re: ad244] #5340926 02/04/20 03:35 PM
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Originally Posted by ad244
Originally Posted by paulri
But if I get an aftermarket filter that is specified for my engine, then why worry? If the filter manufacturer is doing more than just matching the threads, they are making sure that the filter does meet the OEM specs for bypass, also, aren't they?

Originally Posted by Gebo
This is one reason I only use OEM filters on my cars and OPE.


Originally Posted by ad244
And if so, why is this not a thing we actively worry about?


I'd say a good portion of the time we dont know the filters that we use are actually spec'd for our engine. Just that they install correctly. The pressure could be different was my concern.


I always use a filter that is spec'ed for the vehicle/engine. Never just one that screws on properly.


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Filter Bypass Pressure... Why doesn't this matter? [Re: FordBroncoVWJeta] #5340943 02/04/20 03:54 PM
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Originally Posted by FordBroncoVWJeta
The Fram spec'd for my Jetta is 12 PSI. The oem one is 36 PSI. No way would I put a 3x different filter on my car.

Possibly lack of interest for that application. VW can’t decide on cartridge or spin-on filters!

My application is a 22psi bypass and the Fram XG12060 has so far been in very low production. New GM engines since 2013 have needed this bypass since they take the oil pressure reading from the galleys, not the pump. iirc, Subaru does the same, hence the higher bypass spec.


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Re: Filter Bypass Pressure... Why doesn't this matter? [Re: paulri] #5340951 02/04/20 04:04 PM
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Originally Posted by paulri
From one website (http://oilfilterdata.com/index.php), i just found that the Fram EG3614 that fits both engines in my sig, is 12 PSI bypass. The Wix equivalent is 8-11. I could not find the Toyota oem filter specs.

Thanks for bringing this up--one more thing for us to obsess on cool

I would hope that the aftermarket filter companies would give us a filter that is similar to the OEM specs, although as you said we just don't know (unless the specs are published).

Does anyone know of Toyota OEM filter bypass pressure? My filter is the 90915-YZZD1.

Originally Posted by ad244
I'd say a good portion of the time we dont know the filters that we use are actually spec'd for our engine. Just that they install correctly. The pressure could be different was my concern.


It’s 12-14 I read that a few years ago somewhere from Toyota. The Toyota and Fram for Toyota have very similar bypass valves. You can actually put the Fram valve into a Toyota filter and vice versa. The pressure by hand feels the same. I tried it once.
Unrelated but while searching I ran across this video from Toyota. I see a .01 mm filtration claim or 10 microns. Not by the multi pass test they just say it. Actually they say less than 10 microns which has to mean essentially 10. Still it’s less.

https://m.youtube.com/watch?v=j15x1umneYI


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