Baldwin BT778 vs WIX 57251: Oil Filter Compatibility
Compare Baldwin BT778 and WIX 57251 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 1-12 thread.
Quick verdict
Large bypass PSI mismatch: 20 psi · Candidate adds ADBV
- 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 BT778 and WIX 57251 specifications
How matching is scored| Specification | Baldwin BT778 | WIX 57251 |
|---|---|---|
| Thread size | 1-12 | 1-12 |
| Gasket OD | 71.4 mm | 72.01 mm |
| Gasket ID | 62.7 mm | 61.85 mm |
| Can OD | 93.7 mm | 93.73 mm |
| Height | 221.5 mm | 206.5 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 30 | 50 |
| Anti-drainback valve | No | Yes |
What matters in this specific comparison
Thread size matches: both are 1-12.
Gasket OD differs by 0.6 mm (Baldwin BT778: 71.4 mm, WIX 57251: 72.01 mm).
Gasket ID differs by 0.9 mm (Baldwin BT778: 62.7 mm, WIX 57251: 61.85 mm).
Baldwin BT778 is 15 mm taller (Baldwin BT778: 221.5 mm, WIX 57251: 206.5 mm) -- check clearance before substituting.
Can OD is identical at 93.7 mm.
Both open their bypass valve in a comparable range: Baldwin BT778 at 30-30 psi, WIX 57251 at 50-50 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.