FRAM PH9637 vs WIX WL7421: Oil Filter Compatibility
Compare FRAM PH9637 and WIX WL7421 oil filters by compatibility, dimensions, thread size, gasket fit, bypass valve, anti-drainback valve status, and match confidence. Use this comparison as a fitment review, not as an automatic substitution guarantee. Both use a M22x1.5 thread.
Quick verdict
Candidate adds internal bypass; usually redundant with engine-mounted bypass
- Thread size is the first hard-fit check for any comparison of spin-on filters.
- Gasket OD and gasket ID are the most important seal-related dimensions.
- Height differences can matter for clearance even when thread and gasket fit appear close.
- Bypass and anti-drainback differences may be important, depending on the application.
FRAM PH9637 and WIX WL7421 specifications
How matching is scored| Specification | FRAM PH9637 | WIX WL7421 |
|---|---|---|
| Thread size | M22X1,5 | M22x1.5 |
| Gasket OD | 72 mm | 70.87 mm |
| Gasket ID | 62 mm | 61.98 mm |
| Can OD | 95 mm | 94 mm |
| Height | 145 mm | 170 mm |
| Internal bypass valve | No | Yes |
| Bypass PSID | Not applicable | 14 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are M22x1.5.
Gasket OD differs by 1.1 mm (FRAM PH9637: 72 mm, WIX WL7421: 70.87 mm).
Gasket ID is identical at 62 mm.
WIX WL7421 is 25 mm taller (FRAM PH9637: 145 mm, WIX WL7421: 170 mm) -- check clearance before substituting.
Can OD differs by 1 mm (FRAM PH9637: 95 mm, WIX WL7421: 94 mm).
Bypass valve presence differs: WIX WL7421 has one, FRAM PH9637 does not.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.