Risks of running a lower pressure bypass

[Al]

A filter that flows better and has a higher holding capacity doesn't need as high of a bypass valve setting.
Like said many times, the bypass valve setting is based on the filter design as much as it is on the vehicle the filter is used on.

Both important points for sure ZEE!! And funny that Fram and oithers have speced their filters with way lower settings than Subaru's requirement. Funny that the internet is not rife with claims of destroyed subarus that have used hundreds of millions of low bypass filters in the 20+ years that Subaru has required that hisettiong..oh well...

 

[4WD]

A pump relief valve is a well engineered and precision made piece of kit … it has to be … tough duty.
The bypass on a $5 filter is none of the above … if that cheap part was to see a great deal of flow … you’d know it when you cut one open, but they always look like new.

 

[ZeeOSix]

Both important points for sure ZEE!! And funny that Fram and oithers have speced their filters with way lower settings than Subaru's requirement. Funny that the internet is not rife with claims of destroyed subarus that have used hundreds of millions of low bypass filters in the 20+ years that Subaru has required that hisettiong..oh well...

It would be very interesting to see a flow vs delta-p flow curve on an OEM Subaru filter. If it had pretty restrictive flow then that would be one reason why Subaru uses a high bypass valve setting on the OEM filters. We all know Subarus have pretty beefy oil pumps that put out lots of volume, so that's another factor, but how much of it is the high flow pump vs the flow performance of OEM Subaru filter?

 

[ZeeOSix]

A pump relief valve is a well engineered and precision made piece of kit … it has to be … tough duty.
The bypass on a $5 filter is none of the above … if that cheap part was to see a great deal of flow … you’d know it when you cut one open, but they always look like new.

Really nothing to wear out on a filter bypass valve. It just opens and closes. In one of Fram's YouTube vidoes, it shows them testing the bypass valve to 1 million cycles.

 

[Cujet]

In our engine testing (and on many modern aircraft) we can view the pressure differential across a filter. As a very general rule, the pressure loss across a clean filter is around 5PSI. A little more on startup.

EDIT: I found a thread here: https://bobistheoilguy.com/forums/threads/differential-pressure-gauge-installed.192952/

and here

https://bobistheoilguy.com/forums/threads/differential-pressure-testing-update.195296/

 

[nobb]

The common Hyundai/Kia filter also has a ~20 psid relief rating while the aftermarket filters such as Wix use a standard ~12 psid.

There used to be a fiasco where Hyundai issued a TSB such that some filters may cause a ticking sound and the recommendation was to switch to an OE filter. This led to an influx of people becoming OE filter Nazis without any real understanding beyond speculation why. I've yet to see a good explanation for this.

 

[ZeeOSix]

The common Hyundai/Kia filter also has a ~20 psid relief rating while the aftermarket filters such as Wix use a standard ~12 psid.

There used to be a fiasco where Hyundai issued a TSB such that some filters may cause a ticking sound and the recommendation was to switch to an OE filter. This led to an influx of people becoming OE filter Nazis without any real understanding beyond speculation why. I've yet to see a good explanation for this.

It was probably started by couterfiet Hyundai/Kia oil filters being used that were compete junk and did cause issues. Then it seems Hyundai/Kia has made it sound like any non-OEM filter is bad.

 

[nobb]

It was probably started by couterfiet Hyundai/Kia oil filters being used that were compete junk and did cause issues. Then it seems Hyundai/Kia has made it sound like any non-OEM filter is bad.

Well the way it's worded in the TSB may imply there's some aftermarket ones that cause problems too. A tech could not really distinguish if a filter is counterfeit or not.

As a result, it's become heresy to suggest anything other than an OE filter in any Hyundai/Kia discussion board. But beyond anecdotal comments no one can seem to give a technical explanation as to why.

 

[ZeeOSix]

Well the way it's worded in the TSB may imply there's some aftermarket ones that cause problems too. A tech could not really distinguish if a filter is counterfeit or not.

As a result, it's become heresy to suggest anything other than an OE filter in any Hyundai/Kia discussion board. But beyond anecdotal comments no one can seem to give a technical explanation as to why.

True that most people including techs couldn't tell counterfeits from real, especially on all the aftermarket filters. There could have been some really bad aftermarket no-name filters that did cause problems along the way - filters so bad that they choked flow way too much and cause the pump to hit pressure relief and/or the filter to bypass under normal driving conditions. Therefore, I'm thinking Hyundai/Kia just tried to nip it all in the bud by just saying to only use OEM oil filters. That way it takes all the guess work out of the equation for them, and also sells more oil filter.

 

[2016 Outback]

So what if some oil jgues thru the bypass. That oil has been filtered a few seconds before. Old VW's never even had an oil filter.

I refuse to believe why a manufacturer like Subaru (for instance) needs to have a higher bypass filter when no one else does. I doubt they know more than ford, toyots, GM, Mazda..on and on. And I am an admitted Subary fanboy.

I used regular non OEM filters in my subarus for 14 years with no problems.

https://bobistheoilguy.com/forums/attachments/mc-10137653-9999-pdf.39620/

 

[Bettez88]

[URL
unfurl="true"]https://m.wixfilters.com/Search/PartDetail?PartID=2168037%20&Source=WESR[/URL]

https://www.fram.com/parts-search/P...IgJxAGhAdQDYCMADAEwCcRWAdgK556a32N0NNusv0C6QA

Use either of these and sleep at night

 

[Scargod]

[URL
unfurl="true"]https://m.wixfilters.com/Search/PartDetail?PartID=2168037%20&Source=WESR[/URL]

https://www.fram.com/parts-search/P...IgJxAGhAdQDYCMADAEwCcRWAdgK556a32N0NNusv0C6QA

Use either of these and sleep at night

Subaru filter threads are Threads are M20 X 1.5. That filter will not work on a Subie.
I created a document to gather data on filters that fit or may fit, based on headers used and whether a "oil cooler" heat exchanger is used.
On my race car I've used big racing filters for Fords on a remote filter block. Most have lower bypass pressures. I've got over 50 racing hours on the current engine and track pressures usually are around 80, hot.
Google Doc on Subaru oil Filters

 

[2016 Outback]

Subaru filter threads are Threads are M20 X 1.5. That filter will not work on a Subie.
I created a document to gather data on filters that fit or may fit, based on headers used and whether a "oil cooler" heat exchanger is used.
On my race car I've used big racing filters for Fords on a remote filter block. Most have lower bypass pressures. I've got over 50 racing hours on the current engine and track pressures usually are around 80, hot.
Google Doc on Subaru oil Filters

NICE! Great info on filters.