Baldwin B131 vs WIX 51785: Oil Filter Compatibility
Compare Baldwin B131 and WIX 51785 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.
Baldwin B131 and WIX 51785 specifications
How matching is scored| Specification | Baldwin B131 | WIX 51785 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 71.98 mm | 72.77 mm |
| Gasket ID | 62.53 mm | 61.49 mm |
| Can OD | 77 mm | 75.34 mm |
| Height | 87.3 mm | 90.8 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 8 | 8 - 11 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are 3/4-16.
Gasket OD differs by 0.8 mm (Baldwin B131: 71.98 mm, WIX 51785: 72.77 mm).
Gasket ID differs by 1 mm (Baldwin B131: 62.53 mm, WIX 51785: 61.49 mm).
WIX 51785 is 3.5 mm taller (Baldwin B131: 87.3 mm, WIX 51785: 90.8 mm) -- check clearance before substituting.
Can OD differs by 1.7 mm (Baldwin B131: 77 mm, WIX 51785: 75.34 mm).
Both open their bypass valve in a comparable range: Baldwin B131 at 8-8 psi, WIX 51785 at 8-11 psi.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.