FRAM PH5046 vs WIX 51381: Oil Filter Compatibility
Compare FRAM PH5046 and WIX 51381 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.
FRAM PH5046 and WIX 51381 specifications
How matching is scored| Specification | FRAM PH5046 | WIX 51381 |
|---|---|---|
| Thread size | M20X1,5 | M20x1.5 |
| Gasket OD | 71 mm | 71.98 mm |
| Gasket ID | 61 mm | 62.53 mm |
| Can OD | 68 mm | 92.99 mm |
| Height | 85 mm | 80 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 12 | 12 - 15 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are M20x1.5.
Gasket OD differs by 1 mm (FRAM PH5046: 71 mm, WIX 51381: 71.98 mm).
Gasket ID differs by 1.5 mm (FRAM PH5046: 61 mm, WIX 51381: 62.53 mm).
FRAM PH5046 is 5 mm taller (FRAM PH5046: 85 mm, WIX 51381: 80 mm) -- check clearance before substituting.
Can OD differs by 25 mm (FRAM PH5046: 68 mm, WIX 51381: 92.99 mm).
Both open their bypass valve in a comparable range: FRAM PH5046 at 12-12 psi, WIX 51381 at 12-15 psi.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.