FRAM PH43 vs WIX 51355: Oil Filter Compatibility
Compare FRAM PH43 and WIX 51355 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 3/4-16 thread.
Quick verdict
Large bypass PSI mismatch: 21 psi
- 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 PH43 and WIX 51355 specifications
How matching is scored| Specification | FRAM PH43 | WIX 51355 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 71.1 mm | 70.48 mm |
| Gasket ID | 62.5 mm | 62.23 mm |
| Can OD | 93.7 mm | 95.12 mm |
| Height | 111.1 mm | 113.7 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 12 | 33 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are 3/4-16.
Gasket OD differs by 0.6 mm (FRAM PH43: 71.1 mm, WIX 51355: 70.48 mm).
Gasket ID differs by 0.3 mm (FRAM PH43: 62.5 mm, WIX 51355: 62.23 mm).
WIX 51355 is 2.6 mm taller (FRAM PH43: 111.1 mm, WIX 51355: 113.7 mm) -- check clearance before substituting.
Can OD differs by 1.4 mm (FRAM PH43: 93.7 mm, WIX 51355: 95.12 mm).
Both open their bypass valve in a comparable range: FRAM PH43 at 12-12 psi, WIX 51355 at 33-33 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.