Donaldson P550965 vs Baldwin B156: Oil Filter Compatibility
Compare Donaldson P550965 and Baldwin B156 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 M22x1.5 thread.
Quick verdict
Closest known dimensional difference: height -8.4 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.
Donaldson P550965 and Baldwin B156 specifications
How matching is scored| Specification | Donaldson P550965 | Baldwin B156 |
|---|---|---|
| Thread size | M22x1.5 | M22x1.5 |
| Gasket OD | 71 mm | 72 mm |
| Gasket ID | 61 mm | 62 mm |
| Can OD | 93 mm | 93.7 mm |
| Height | 91 mm | 82.6 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 12 - 17 | 20 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are M22x1.5.
Gasket OD differs by 1 mm (Donaldson P550965: 71 mm, Baldwin B156: 72 mm).
Gasket ID differs by 1 mm (Donaldson P550965: 61 mm, Baldwin B156: 62 mm).
Donaldson P550965 is 8.4 mm taller (Donaldson P550965: 91 mm, Baldwin B156: 82.6 mm) -- check clearance before substituting.
Can OD differs by 0.7 mm (Donaldson P550965: 93 mm, Baldwin B156: 93.7 mm).
Both open their bypass valve in a comparable range: Donaldson P550965 at 12-17 psi, Baldwin B156 at 20-20 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.