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#4811336 - 07/11/18 01:20 PM STP XL Filters - heads up!
rooflessVW Offline


Registered: 12/24/11
Posts: 4301
Loc: North Carolina
Both STP XL filters for the LS engines (3506 and 3675) have bypass valves.

They're not supposed to!

Heading back now to make a swap. Hopefully they help me out.
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#4811341 - 07/11/18 01:24 PM Re: STP XL Filters - heads up! [Re: rooflessVW]
dogememe Offline


Registered: 04/15/17
Posts: 692
Loc: SF BAY AREA, CA
Originally Posted By: rooflessVW
Both STP XL filters for the LS engines (3506 and 3675) have bypass valves.

They're not supposed to!

Heading back now to make a swap. Hopefully they help me out.


can I ask you something? I am not confirming or denying the presence of bypass valves in those two filters (since I never shop at Autozone where I believe those are sold) but how is having a bypass valve detrimental in whatever application? Thank you!
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#4811362 - 07/11/18 01:40 PM Re: STP XL Filters - heads up! [Re: rooflessVW]
Chris142 Online   content


Registered: 06/05/03
Posts: 16947
Loc: Deplorable in apple valley, ca
Having the bypass valve is a non issue.
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#4811383 - 07/11/18 01:57 PM Re: STP XL Filters - heads up! [Re: rooflessVW]
rooflessVW Offline


Registered: 12/24/11
Posts: 4301
Loc: North Carolina
Having the bypass valve is not a non-issue if your car is specifically modified to not have a filter bypass.

In any case - the LS has an internal bypass, so why spend the money to put one in the can where it's not needed?

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"Zed's dead baby, Zed's dead."

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#4811409 - 07/11/18 02:22 PM Re: STP XL Filters - heads up! [Re: rooflessVW]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17895
Loc: PNW
Probably wouldn't hurt to have a "double bypass" as long as the filter's bypass valve was set higher than the built-in block bypass valve.

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#4811421 - 07/11/18 02:32 PM Re: STP XL Filters - heads up! [Re: ZeeOSix]
rooflessVW Offline


Registered: 12/24/11
Posts: 4301
Loc: North Carolina
Originally Posted By: ZeeOSix
Probably wouldn't hurt to have a "double bypass" as long as the filter's bypass valve was set higher than the built-in block bypass valve.

It was just something I'd never seen before. Never seen a filter for this app with a bypass, Fram HP20 excluded.
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"Zed's dead baby, Zed's dead."

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#4811444 - 07/11/18 03:00 PM Re: STP XL Filters - heads up! [Re: rooflessVW]
doolah02 Offline


Registered: 04/27/14
Posts: 153
Loc: FL USA
I believe Mobil 1 filters have the bypass valve in that location, that would be great for startup noise
in my Sport Trac.

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#4811449 - 07/11/18 03:09 PM Re: STP XL Filters - heads up! [Re: doolah02]
rooflessVW Offline


Registered: 12/24/11
Posts: 4301
Loc: North Carolina
Originally Posted By: doolah02
I believe Mobil 1 filters have the bypass valve in that location, that would be great for startup noise
in my Sport Trac.

M1-107A and M1-206A are without bypass valves, as they should be.
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"Zed's dead baby, Zed's dead."

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#4811765 - 07/11/18 08:56 PM Re: STP XL Filters - heads up! [Re: rooflessVW]
rooflessVW Offline


Registered: 12/24/11
Posts: 4301
Loc: North Carolina
Guys at AZ helped me out and hooked me up with a K&N HP-1007.
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"Zed's dead baby, Zed's dead."

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#4811775 - 07/11/18 09:00 PM Re: STP XL Filters - heads up! [Re: rooflessVW]
SubieRubyRoo Offline


Registered: 05/14/12
Posts: 1232
Loc: Winchester, Indiana
Must be some reason they did it; manufacturing companies won't arbitrarily make something more expensive if not needed, and I'm sure a bypass is more expensive than a solid endcap. That being said, it's not the end of the world.

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#4811806 - 07/11/18 09:20 PM Re: STP XL Filters - heads up! [Re: rooflessVW]
Rolla07 Offline


Registered: 11/05/11
Posts: 4752
Loc: MTL, CANADA
Maybe its done to work on other makes that require the bypass that also use this filter. Id guess having one when not needed is better than not having one when needed?
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#4812916 - 07/13/18 06:53 AM Re: STP XL Filters - heads up! [Re: Rolla07]
Sayjac Offline


Registered: 10/13/08
Posts: 12323
Loc: The Old North State
Quote:
Maybe its done to work on other makes that require the bypass that also use this filter. Id guess having one when not needed is better than not having one when needed?

Seeing as the STP XL consolidates applications, I'd say that's a reasonable assumption. And yes, having one where not spec'd infinitely better than not having one where it is.

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#4812919 - 07/13/18 06:57 AM Re: STP XL Filters - heads up! [Re: rooflessVW]
rooflessVW Offline


Registered: 12/24/11
Posts: 4301
Loc: North Carolina
Interesting to me that it's only the one line of filters that "consolidate," and they're made in China...

Edit: I mean consumer lines of filters. I know lube shop filter lines consolidate.
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"Zed's dead baby, Zed's dead."

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#4813053 - 07/13/18 10:08 AM Re: STP XL Filters - heads up! [Re: rooflessVW]
JeePing Offline


Registered: 08/10/06
Posts: 116
Loc: Kentucky
Originally Posted By: rooflessVW
Having the bypass valve is not a non-issue if your car is specifically modified to not have a filter bypass.

In any case - the LS has an internal bypass, so why spend the money to put one in the can where it's not needed?

...................


Holly [censored] ... people who read this. please, do not listen to the nonsense above. Every engine, with pressurized lubricating system, driven by positive displacement pump has a pressure relief. Or what uninformed poster calls a "bypass". The reason for filter to have pressure relief valve internal and independent is to keep oil flowing to the engine even if filter is completely clogged. If filter does not have a relief, oil will simply dump into the sump with out circulating through the engine.
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#4813091 - 07/13/18 11:10 AM Re: STP XL Filters - heads up! [Re: JeePing]
bullwinkle Offline


Registered: 10/09/04
Posts: 7719
Loc: Cincinnati, OH, USA
Originally Posted By: JeePing
Originally Posted By: rooflessVW
Having the bypass valve is not a non-issue if your car is specifically modified to not have a filter bypass.

In any case - the LS has an internal bypass, so why spend the money to put one in the can where it's not needed?

...................


Holly [censored] ... people who read this. please, do not listen to the nonsense above. Every engine, with pressurized lubricating system, driven by positive displacement pump has a pressure relief. Or what uninformed poster calls a "bypass". The reason for filter to have pressure relief valve internal and independent is to keep oil flowing to the engine even if filter is completely clogged. If filter does not have a relief, oil will simply dump into the sump with out circulating through the engine.
Actually, there are usually TWO pressure relief valves-one on the oil pump (which dumps the oil back into the sump), and one either in the filter or in the block that allows oil to bypass a blocked filter OR during extreme cold/thick oil events. Some SB Chevy oil filters have a filter bypass, other ones don't-and I have never heard of any issues caused by having the extra one in the filter!
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