WIX 51318 vs Baldwin B243: Oil Filter Compatibility
Compare WIX 51318 and Baldwin B243 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
Closest known dimensional difference: gasket OD -1.8 mm. Verify application-specific requirements before substituting.
- 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 51318 and Baldwin B243 specifications
How matching is scored| Specification | WIX 51318 | Baldwin B243 |
|---|---|---|
| Thread size | M20x1.5 | M20x1.5 |
| Gasket OD | 64.47 mm | 62.7 mm |
| Gasket ID | 56.49 mm | 54.8 mm |
| Can OD | 93.29 mm | 76.2 mm |
| Height | 122 mm | 123 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 8 - 11 | 8 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are M20x1.5.
Gasket OD differs by 1.8 mm (WIX 51318: 64.47 mm, Baldwin B243: 62.7 mm).
Gasket ID differs by 1.7 mm (WIX 51318: 56.49 mm, Baldwin B243: 54.8 mm).
Baldwin B243 is 1 mm taller (WIX 51318: 122 mm, Baldwin B243: 123 mm) -- check clearance before substituting.
Can OD differs by 17.1 mm (WIX 51318: 93.29 mm, Baldwin B243: 76.2 mm).
Both open their bypass valve in a comparable range: WIX 51318 at 8-11 psi, Baldwin B243 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.