Baldwin B243 vs WIX 51344MP: Oil Filter Compatibility
Compare Baldwin B243 and WIX 51344MP 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 M20x1.5 thread.
Quick verdict
Both use a M20x1.5 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 B243 and WIX 51344MP specifications
How matching is scored| Specification | Baldwin B243 | WIX 51344MP |
|---|---|---|
| Thread size | M20x1.5 | M20x1.5 |
| Gasket OD | 62.7 mm | 63.25 mm |
| Gasket ID | 54.8 mm | 55.88 mm |
| Can OD | 76.2 mm | 82.35 mm |
| Height | 123 mm | 103.4 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 M20x1.5.
Gasket OD differs by 0.5 mm (Baldwin B243: 62.7 mm, WIX 51344MP: 63.25 mm).
Gasket ID differs by 1.1 mm (Baldwin B243: 54.8 mm, WIX 51344MP: 55.88 mm).
Baldwin B243 is 19.6 mm taller (Baldwin B243: 123 mm, WIX 51344MP: 103.4 mm) -- check clearance before substituting.
Can OD differs by 6.1 mm (Baldwin B243: 76.2 mm, WIX 51344MP: 82.35 mm).
Both open their bypass valve in a comparable range: Baldwin B243 at 8-8 psi, WIX 51344MP 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.