WIX 51820 vs Baldwin B975: Oil Filter Compatibility
Compare WIX 51820 and Baldwin B975 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
Both use a 1-12 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 51820 and Baldwin B975 specifications
How matching is scored| Specification | WIX 51820 | Baldwin B975 |
|---|---|---|
| Thread size | 1-12 | 1-12 |
| Gasket OD | 71.98 mm | 71.4 mm |
| Gasket ID | 62.53 mm | 62.7 mm |
| Can OD | 93.93 mm | 93.7 mm |
| Height | 198.8 mm | 181 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 22 | 8 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are 1-12.
Gasket OD differs by 0.6 mm (WIX 51820: 71.98 mm, Baldwin B975: 71.4 mm).
Gasket ID differs by 0.2 mm (WIX 51820: 62.53 mm, Baldwin B975: 62.7 mm).
WIX 51820 is 17.8 mm taller (WIX 51820: 198.8 mm, Baldwin B975: 181 mm) -- check clearance before substituting.
Can OD differs by 0.2 mm (WIX 51820: 93.93 mm, Baldwin B975: 93.7 mm).
Both open their bypass valve in a comparable range: WIX 51820 at 22-22 psi, Baldwin B975 at 8-8 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.