What is the difference between the WIX racing Oil Filter part number 51222R and 57003R ? Both these filters cross reference to the Fram HP6 racing filter. I see that Fram has a better (micron filtering wise) racing oil filter---HP6A.

I'm not positive on those part numbers but some have anti drain valves and some dont! I ran into that once and didn't need the anti drain feature.

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Part Number: 51222R
UPC Number: 765809129047
Principal Application: Racing Applications Only
All Applications
Style: Spin-On Lube Filter
Service: Lube
Type: Full Flow
Media: Paper
Height: 6.210
Outer Diameter Top: 4.600
Outer Diameter Bottom: Closed
Thread Size: 1 1/2-12
By-Pass Valve Setting-PSI: 18-22
Max Flow Rate: 28 GPM

Gasket Diameters
Number O.D. I.D. Thk.
Attached 4.320 3.820 0.365

Part Number: 57003R
UPC Number: 765809129085
Principal Application: Racing Applications Only
All Applications
Style: Spin-On Lube Filter
Service: Lube
Type: Full Flow
Media: Paper
Height: 6.210
Outer Diameter Top: 4.600
Outer Diameter Bottom: Closed
Thread Size: 1 1/2-12
By-Pass Valve Setting-PSI: 18-22
Max Flow Rate: 30 GPM

Gasket Diameters
Number O.D. I.D. Thk.
Attached 4.320 3.820 0.365

As u can see on the spec sheet..the 57003 R as a little bigger flow, thats it !!!!!!!

Thank you for the specs on the WIX filters.
Question: By-Pass Valve Setting-PSI: 18-22 ?

During certain rpm's, would not the running psi exceed this number?

What are the micron filtering capabilities of both filters? Interesting-----Fram does not list their's either.