WIX 51431 vs Baldwin BT348: Oil Filter Compatibility
Compare WIX 51431 and Baldwin BT348 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
Large bypass PSI mismatch: 20.5 psi
- 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 51431 and Baldwin BT348 specifications
How matching is scored| Specification | WIX 51431 | Baldwin BT348 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 71.35 mm | 71.4 mm |
| Gasket ID | 61.85 mm | 62.7 mm |
| Can OD | 107.7 mm | 108 mm |
| Height | 143.2 mm | 147.6 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 8 - 11 | 30 |
| 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 51431: 71.35 mm, Baldwin BT348: 71.4 mm).
Gasket ID differs by 0.9 mm (WIX 51431: 61.85 mm, Baldwin BT348: 62.7 mm).
Baldwin BT348 is 4.4 mm taller (WIX 51431: 143.2 mm, Baldwin BT348: 147.6 mm) -- check clearance before substituting.
Can OD differs by 0.3 mm (WIX 51431: 107.7 mm, Baldwin BT348: 108 mm).
Both open their bypass valve in a comparable range: WIX 51431 at 8-11 psi, Baldwin BT348 at 30-30 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.