WIX 51647 vs NAPA Gold 1191: Oil Filter Compatibility
Compare WIX 51647 and NAPA Gold 1191 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
Closest known dimensional difference: gasket OD +2.4 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 51647 and NAPA Gold 1191 specifications
How matching is scored| Specification | WIX 51647 | NAPA Gold 1191 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 71.98 mm | 69.6 mm |
| Gasket ID | 62.53 mm | 60.2 mm |
| Can OD | 92.96 mm | 92.96 mm |
| Height | 131.5 mm | 131.5 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 12 - 15 | 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 2.4 mm (WIX 51647: 71.98 mm, NAPA Gold 1191: 69.6 mm).
Gasket ID differs by 2.3 mm (WIX 51647: 62.53 mm, NAPA Gold 1191: 60.2 mm).
Height is identical at 131.5 mm.
Can OD is identical at 92.96 mm.
Both open their bypass valve in a comparable range: WIX 51647 at 12-15 psi, NAPA Gold 1191 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.