WIX 51785 vs NAPA Gold 1215: Oil Filter Compatibility
Compare WIX 51785 and NAPA Gold 1215 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 51785 and NAPA Gold 1215 specifications
How matching is scored| Specification | WIX 51785 | NAPA Gold 1215 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 72.77 mm | 71.1 mm |
| Gasket ID | 61.49 mm | 62 mm |
| Can OD | 75.34 mm | 74.19 mm |
| Height | 90.8 mm | 86.46 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 8 - 11 | 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 1.7 mm (WIX 51785: 72.77 mm, NAPA Gold 1215: 71.1 mm).
Gasket ID differs by 0.5 mm (WIX 51785: 61.49 mm, NAPA Gold 1215: 62 mm).
WIX 51785 is 4.3 mm taller (WIX 51785: 90.8 mm, NAPA Gold 1215: 86.46 mm) -- check clearance before substituting.
Can OD differs by 1.2 mm (WIX 51785: 75.34 mm, NAPA Gold 1215: 74.19 mm).
Both open their bypass valve in a comparable range: WIX 51785 at 8-11 psi, NAPA Gold 1215 at 13-19 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.