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NAPA Gold 1381 still made by WIX?

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Supporting Member
Dec 21, 2008
Winnipeg, MB_Canada
This used to be a thing a half decade or more ago, but I've been wondering post-pandemic if our good ol' Gold 1381 is till made by WIX..

They're 63% more expensive than an OEM filter up here, which I've used for many years, and lately I've been wondering if OEM is the reason behind my oil pressure skyrocketing to 60psi by the time I hit 2.5k even with a ported OFH and head mod on no shafts.

So I figured, why not try the ol trusty Gold since I can get the Napas local same-day, but not if they've switched to a lower quality manufacturer.

anybody know?


15+ Year Contributor
Aug 27, 2006
Regina, SK_Canada
Napa's website still lists the 1381 as made by wix, and as far as I know they havent changed anything.


Proven Member
Sep 20, 2022
Shippensburg, Pennsylvania
I’m not sure on the filter as I’ve never ran a wix oil filter. I’ve had good results though with the wix fuel filter and water separator I used to run on my fass 165 pump on my 2nd gen Cummins.

Have you tried running a 1.8 mirage spring in the ofh relief valve. I run with no bs’s in conjunction with the 1.8 mirage spring, porting and running an external oil cooler on an evo3 ofh. I noticed the biggest difference with the spring though. Some people use multiple crush washers instead but I like the oem look/install. With 3 of them I am finally happy with where my oil pressure is now.


chrysler kid

20+ Year Contributor
Dec 20, 2002
Mckinney, Texas
Ive always heard terrible things about fram, specifically the drain back valves.

Ive been seeing propaganda about motorcraft filters being very good. The FL810A is a big fatty that works on our applications.

I have been having issues on my civic si having cold start valve rattle on Mobil 1 filters, and switching to a motorcraft solved the problem


Supporting Member
Dec 21, 2008
Winnipeg, MB_Canada
I've generally always run the fat stubby 1G OEM filter, which I recall has more internal volume than the slimmer, taller one. That's the one that gives me apparent high pressure.

Funny enough, this short block came with the car and I haven't touched it, yet it has basically the same pressure as my last one. It doesn't have balance shafts and I don't know the state of the OFH porting, if any. (My original post was referring to my last short block in terms of OFH porting.)

But it does have my original head with a fairly aggressive oil mod.

With the pressure reduction methods in use, are we ensuring correct flow volume as well?

We're on Boost

15+ Year Contributor
Aug 25, 2007
Seattle area, Washington
I like the fat stubby ones too, like the Wix 51381 (or NAPA Gold 1381).
Besides being large, it has a properly high bypass valve setting, and correct gasket diameters for my OFH.
I looked for Bypass Valve psi range setting on the Motorcraft FL810A and all I could find was "yes". No numbers.
This Bypass Valve setting needs to be fairly high for our engines.
Also the gasket ID and OD. Because sometimes people use filters that don't even have the right gasket size for the land on their OFH.
Anyway if somebody can link me to a page that shows those numbers for the FL810A, I'd appreciate it.
Here's what a good spec table looks like for an oil filter:

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