WIX 51324 vs FRAM PH4731: Oil Filter Compatibility
Compare WIX 51324 and FRAM PH4731 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 M20x1.5 thread.
Quick verdict
Both use a M20x1.5 thread.
- 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 51324 and FRAM PH4731 specifications
How matching is scored| Specification | WIX 51324 | FRAM PH4731 |
|---|---|---|
| Thread size | M20x1.5 | M20X1,5 |
| Gasket OD | 71.98 mm | 72 mm |
| Gasket ID | 62.53 mm | 62 mm |
| Can OD | 93.04 mm | 76 mm |
| Height | 110.6 mm | 120 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 8 - 11 | 12 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are M20x1.5.
Gasket OD is identical at 71.98 mm.
Gasket ID differs by 0.5 mm (WIX 51324: 62.53 mm, FRAM PH4731: 62 mm).
FRAM PH4731 is 9.4 mm taller (WIX 51324: 110.6 mm, FRAM PH4731: 120 mm) -- check clearance before substituting.
Can OD differs by 17 mm (WIX 51324: 93.04 mm, FRAM PH4731: 76 mm).
Both open their bypass valve in a comparable range: WIX 51324 at 8-11 psi, FRAM PH4731 at 12-12 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.