WIX 51522MP vs FRAM HP4: Oil Filter Compatibility
Compare WIX 51522MP and FRAM HP4 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
Closest known dimensional difference: height -4 mm. Verify application-specific requirements before substituting.
- 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.
WIX 51522MP and FRAM HP4 specifications
How matching is scored| Specification | WIX 51522MP | FRAM HP4 |
|---|---|---|
| Thread size | 13/16-16 | 13/16-16 |
| Gasket OD | 69.44 mm | 71 mm |
| Gasket ID | 61.72 mm | 62 mm |
| Can OD | 74.19 mm | 95 mm |
| Height | 115 mm | 111 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 13 - 19 | 22 |
| 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 (WIX 51522MP: 69.44 mm, FRAM HP4: 71 mm).
Gasket ID differs by 0.3 mm (WIX 51522MP: 61.72 mm, FRAM HP4: 62 mm).
WIX 51522MP is 4 mm taller (WIX 51522MP: 115 mm, FRAM HP4: 111 mm) -- check clearance before substituting.
Can OD differs by 20.8 mm (WIX 51522MP: 74.19 mm, FRAM HP4: 95 mm).
Both open their bypass valve in a comparable range: WIX 51522MP at 13-19 psi, FRAM HP4 at 22-22 psi -- these ranges do not overlap.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.