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Oct 27th, 2018
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STP XL Filters - heads up!
#4811336
07/11/18 12:20 PM
07/11/18 12:20 PM
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Joined: Dec 2011
Posts: 4,978
North Carolina
rooflessVW
OP
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OP
Joined: Dec 2011
Posts: 4,978
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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Re: STP XL Filters - heads up!
[Re: rooflessVW]
#4811341
07/11/18 12:24 PM
07/11/18 12:24 PM
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Joined: Apr 2017
Posts: 1,338
San Rafael, CA
dogememe
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Joined: Apr 2017
Posts: 1,338
San Rafael, 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!
2010 Ford Escape 2.5 ~90K: Royal Purple 5W-30, AMSOIL SS FE ATF.
1995 Chevy Silverado 5.7 ~276K: Delo 10W-30, AMSOIL OE MV ATF.
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Re: STP XL Filters - heads up!
[Re: rooflessVW]
#4811383
07/11/18 12:57 PM
07/11/18 12:57 PM
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Joined: Dec 2011
Posts: 4,978
North Carolina
rooflessVW
OP
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OP
Joined: Dec 2011
Posts: 4,978
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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Re: STP XL Filters - heads up!
[Re: rooflessVW]
#4811409
07/11/18 01:22 PM
07/11/18 01:22 PM
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Joined: Jul 2010
Posts: 19,193
PNW
ZeeOSix
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Joined: Jul 2010
Posts: 19,193
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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Re: STP XL Filters - heads up!
[Re: ZeeOSix]
#4811421
07/11/18 01:32 PM
07/11/18 01:32 PM
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Joined: Dec 2011
Posts: 4,978
North Carolina
rooflessVW
OP
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OP
Joined: Dec 2011
Posts: 4,978
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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Re: STP XL Filters - heads up!
[Re: rooflessVW]
#4811444
07/11/18 02:00 PM
07/11/18 02:00 PM
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Joined: Apr 2014
Posts: 157
FL USA
doolah02
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Joined: Apr 2014
Posts: 157
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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Re: STP XL Filters - heads up!
[Re: doolah02]
#4811449
07/11/18 02:09 PM
07/11/18 02:09 PM
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Joined: Dec 2011
Posts: 4,978
North Carolina
rooflessVW
OP
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OP
Joined: Dec 2011
Posts: 4,978
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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Re: STP XL Filters - heads up!
[Re: rooflessVW]
#4811806
07/11/18 08:20 PM
07/11/18 08:20 PM
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Joined: Nov 2011
Posts: 4,937
MTL, CANADA
Rolla07
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Joined: Nov 2011
Posts: 4,937
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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Re: STP XL Filters - heads up!
[Re: Rolla07]
#4812916
07/13/18 05:53 AM
07/13/18 05:53 AM
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Joined: Oct 2008
Posts: 12,561
The Old North State
Sayjac
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Joined: Oct 2008
Posts: 12,561
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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Re: STP XL Filters - heads up!
[Re: rooflessVW]
#4812919
07/13/18 05:57 AM
07/13/18 05:57 AM
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Joined: Dec 2011
Posts: 4,978
North Carolina
rooflessVW
OP
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OP
Joined: Dec 2011
Posts: 4,978
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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Re: STP XL Filters - heads up!
[Re: rooflessVW]
#4813053
07/13/18 09:08 AM
07/13/18 09:08 AM
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Joined: Aug 2006
Posts: 118
Kentucky
JeePing
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Joined: Aug 2006
Posts: 118
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.
If it an't broke, take it a part and see why not.
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Re: STP XL Filters - heads up!
[Re: JeePing]
#4813091
07/13/18 10:10 AM
07/13/18 10:10 AM
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Joined: Oct 2004
Posts: 8,177
Cincinnati, OH, USA
bullwinkle
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Joined: Oct 2004
Posts: 8,177
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!
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), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
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