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Being that my car is a 99 I will be ordering and Oil Filter housing ASAP.
Checked out the Wix filters.
This is the one for my 944
Part Number: 51287
UPC Number: 765809512870
Style: Spin-On Lube Filter
Service: Lube
Type: Full Flow
Media: Enhanced Cellulose
Height: 4.828 (123)*
Outer Diameter Top: 2.921 (74)*
Outer Diameter Bottom: Closed:
Thread Size: 20X1.5 MM
By-Pass Valve Setting-PSI: 30
Anti-Drain Back Valve: Yes
Burst Pressure-PSI: 310
Max Flow Rate: 9-11 GPM
Nominal Micron Rating: 19
As you can see - The filter has its own built in bypass -
I believe a week bypass spring would be a very bad thing.
New filter every oil change with the spin on adapter would guarantee a strong spring
Or every other year change the filter housing for 20 buck.
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