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#4811336 - 07/11/18 01:20 PM
STP XL Filters - heads up!
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Registered: 12/24/11
Posts: 4301
Loc: North Carolina
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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.
_________________________
"Zed's dead baby, Zed's dead."
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#4811341 - 07/11/18 01:24 PM
Re: STP XL Filters - heads up!
[Re: rooflessVW]
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Registered: 04/15/17
Posts: 692
Loc: SF BAY AREA, CA
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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!
_________________________
1997 Suburban 5.7 ~214K Miles, VWB 5W-30, VO-55, Personal.
2007 Crown Vic P71 4.6 ~124K Miles, VAS 5W-30, RP 20-820, Personal.
2010 Escape 2.5 ~73K Miles, VAS 5W-30, Wix 51348, Rented on Turo.
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#4811362 - 07/11/18 01:40 PM
Re: STP XL Filters - heads up!
[Re: rooflessVW]
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Registered: 06/05/03
Posts: 16947
Loc: Deplorable in apple valley, ca
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Having the bypass valve is a non issue.
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02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
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#4811383 - 07/11/18 01:57 PM
Re: STP XL Filters - heads up!
[Re: rooflessVW]
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Registered: 12/24/11
Posts: 4301
Loc: North Carolina
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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? 
_________________________
"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]
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Registered: 07/22/10
Posts: 17896
Loc: PNW
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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]
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Registered: 12/24/11
Posts: 4301
Loc: North Carolina
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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.
_________________________
"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]
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Registered: 04/27/14
Posts: 153
Loc: FL USA
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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]
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Registered: 12/24/11
Posts: 4301
Loc: North Carolina
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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.
_________________________
"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]
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Registered: 12/24/11
Posts: 4301
Loc: North Carolina
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Guys at AZ helped me out and hooked me up with a K&N HP-1007.
_________________________
"Zed's dead baby, Zed's dead."
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#4811806 - 07/11/18 09:20 PM
Re: STP XL Filters - heads up!
[Re: rooflessVW]
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Registered: 11/05/11
Posts: 4752
Loc: MTL, CANADA
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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?
_________________________
2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967
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#4812916 - 07/13/18 06:53 AM
Re: STP XL Filters - heads up!
[Re: Rolla07]
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Registered: 10/13/08
Posts: 12323
Loc: The Old North State
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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]
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Registered: 12/24/11
Posts: 4301
Loc: North Carolina
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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.
_________________________
"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]
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Registered: 08/10/06
Posts: 116
Loc: Kentucky
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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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If it an't broke, take it a part and see why not.
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#4813091 - 07/13/18 11:10 AM
Re: STP XL Filters - heads up!
[Re: JeePing]
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Registered: 10/09/04
Posts: 7720
Loc: Cincinnati, OH, USA
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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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06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 15 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
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