Baldwin B178 vs MANN-FILTER W 940/25: Oil Filter Compatibility
Compare Baldwin B178 and MANN-FILTER W 940/25 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
Both use a 3/4-16 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.
Baldwin B178 and MANN-FILTER W 940/25 specifications
How matching is scored| Specification | Baldwin B178 | MANN-FILTER W 940/25 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 69.9 mm | 71.5 mm |
| Gasket ID | 60.9 mm | 62.5 mm |
| Can OD | 76.2 mm | 93.47 mm |
| Height | 130.2 mm | 131.52 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 30 | 30 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are 3/4-16.
Gasket OD differs by 1.6 mm (Baldwin B178: 69.9 mm, MANN-FILTER W 940/25: 71.5 mm).
Gasket ID differs by 1.6 mm (Baldwin B178: 60.9 mm, MANN-FILTER W 940/25: 62.5 mm).
MANN-FILTER W 940/25 is 1.3 mm taller (Baldwin B178: 130.2 mm, MANN-FILTER W 940/25: 131.52 mm) -- check clearance before substituting.
Can OD differs by 17.3 mm (Baldwin B178: 76.2 mm, MANN-FILTER W 940/25: 93.47 mm).
Both open their bypass valve in a comparable range: Baldwin B178 at 30-30 psi, MANN-FILTER W 940/25 at 30-30 psi.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.