WIX 51391 vs NAPA Gold 1391: Oil Filter Compatibility
Compare WIX 51391 and NAPA Gold 1391 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
Both use a 3/4-16 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 51391 and NAPA Gold 1391 specifications
How matching is scored| Specification | WIX 51391 | NAPA Gold 1391 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 62.87 mm | 63 mm |
| Gasket ID | 55.19 mm | 55 mm |
| Can OD | 82.14 mm | 82.14 mm |
| Height | 103.4 mm | 103.4 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 13 - 19 | 13 - 19 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are 3/4-16.
Gasket OD differs by 0.1 mm (WIX 51391: 62.87 mm, NAPA Gold 1391: 63 mm).
Gasket ID differs by 0.2 mm (WIX 51391: 55.19 mm, NAPA Gold 1391: 55 mm).
Height is identical at 103.4 mm.
Can OD is identical at 82.14 mm.
Both open their bypass valve in a comparable range: WIX 51391 at 13-19 psi, NAPA Gold 1391 at 13-19 psi.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.