WIX 51808 vs Baldwin B129: Oil Filter Compatibility
Compare WIX 51808 and Baldwin B129 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: 14 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 51808 and Baldwin B129 specifications
How matching is scored| Specification | WIX 51808 | Baldwin B129 |
|---|---|---|
| Thread size | 1-12 | 1-12 |
| Gasket OD | 71.98 mm | 72 mm |
| Gasket ID | 62.53 mm | 61 mm |
| Can OD | 108.8 mm | 108 mm |
| Height | 186.2 mm | 187.3 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 13 - 19 | 30 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are 1-12.
Gasket OD is identical at 71.98 mm.
Gasket ID differs by 1.5 mm (WIX 51808: 62.53 mm, Baldwin B129: 61 mm).
Baldwin B129 is 1.1 mm taller (WIX 51808: 186.2 mm, Baldwin B129: 187.3 mm) -- check clearance before substituting.
Can OD differs by 0.8 mm (WIX 51808: 108.8 mm, Baldwin B129: 108 mm).
Both open their bypass valve in a comparable range: WIX 51808 at 13-19 psi, Baldwin B129 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.