FRAM HP4 vs WIX 51522: Oil Filter Compatibility
Compare FRAM HP4 and WIX 51522 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 13/16-16 thread.
Quick verdict
Bypass present on both, PSI unknown on one or both
- 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 HP4 and WIX 51522 specifications
How matching is scored| Specification | FRAM HP4 | WIX 51522 |
|---|---|---|
| Thread size | 13/16-16 | 13/16-16 |
| Gasket OD | 71 mm | 69.44 mm |
| Gasket ID | 62 mm | 61.72 mm |
| Can OD | 95 mm | 74.19 mm |
| Height | 111 mm | 115 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 22 | Unknown |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are 13/16-16.
Gasket OD differs by 1.6 mm (FRAM HP4: 71 mm, WIX 51522: 69.44 mm).
Gasket ID differs by 0.3 mm (FRAM HP4: 62 mm, WIX 51522: 61.72 mm).
WIX 51522 is 4 mm taller (FRAM HP4: 111 mm, WIX 51522: 115 mm) -- check clearance before substituting.
Can OD differs by 20.8 mm (FRAM HP4: 95 mm, WIX 51522: 74.19 mm).
Both include an internal bypass valve.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.