WIX 51581 vs Baldwin BT112: Oil Filter Compatibility
Compare WIX 51581 and Baldwin BT112 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 13/16-16 thread.
Quick verdict
Both use a 13/16-16 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 51581 and Baldwin BT112 specifications
How matching is scored| Specification | WIX 51581 | Baldwin BT112 |
|---|---|---|
| Thread size | 13/16-16 | 13/16-16 |
| Gasket OD | 71.98 mm | 71.4 mm |
| Gasket ID | 62.53 mm | 62.7 mm |
| Can OD | 92.96 mm | 93.7 mm |
| Height | 131.5 mm | 136.5 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 8 - 11 | 8 |
| Anti-drainback valve | Yes | No |
What matters in this specific comparison
Thread size matches: both are 13/16-16.
Gasket OD differs by 0.6 mm (WIX 51581: 71.98 mm, Baldwin BT112: 71.4 mm).
Gasket ID differs by 0.2 mm (WIX 51581: 62.53 mm, Baldwin BT112: 62.7 mm).
Baldwin BT112 is 5 mm taller (WIX 51581: 131.5 mm, Baldwin BT112: 136.5 mm) -- check clearance before substituting.
Can OD differs by 0.7 mm (WIX 51581: 92.96 mm, Baldwin BT112: 93.7 mm).
Both open their bypass valve in a comparable range: WIX 51581 at 8-11 psi, Baldwin BT112 at 8-8 psi.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.