Baldwin B99-MPG vs WIX 51801: Oil Filter Compatibility
Compare Baldwin B99-MPG and WIX 51801 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 11/2-16 thread.
Quick verdict
Both use a 11/2-16 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 B99-MPG and WIX 51801 specifications
How matching is scored| Specification | Baldwin B99-MPG | WIX 51801 |
|---|---|---|
| Thread size | 11/2-16 | 11/2-16 |
| Gasket OD | 110 mm | 109.7 mm |
| Gasket ID | 98 mm | 97.03 mm |
| Can OD | 136.5 mm | 135.7 mm |
| Height | 307.2 mm | 252.3 mm |
| Internal bypass valve | No | Yes |
| Bypass PSID | Not applicable | 12 - 15 |
| Anti-drainback valve | No | Yes |
What matters in this specific comparison
Thread size matches: both are 11/2-16.
Gasket OD differs by 0.3 mm (Baldwin B99-MPG: 110 mm, WIX 51801: 109.7 mm).
Gasket ID differs by 1 mm (Baldwin B99-MPG: 98 mm, WIX 51801: 97.03 mm).
Baldwin B99-MPG is 54.9 mm taller (Baldwin B99-MPG: 307.2 mm, WIX 51801: 252.3 mm) -- check clearance before substituting.
Can OD differs by 0.8 mm (Baldwin B99-MPG: 136.5 mm, WIX 51801: 135.7 mm).
Bypass valve presence differs: WIX 51801 has one, Baldwin B99-MPG does not.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.