Donaldson P550934 vs WIX 51287: Oil Filter Compatibility
Compare Donaldson P550934 and WIX 51287 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 M20x1.5 thread.
Quick verdict
Both use a M20x1.5 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.
Donaldson P550934 and WIX 51287 specifications
How matching is scored| Specification | Donaldson P550934 | WIX 51287 |
|---|---|---|
| Thread size | M20x1.5 | M20x1.5 |
| Gasket OD | 72 mm | 69.44 mm |
| Gasket ID | 62 mm | 61.72 mm |
| Can OD | 93 mm | 74.19 mm |
| Height | 136 mm | 122.6 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 8 - 11 | 12 - 15 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are M20x1.5.
Gasket OD differs by 2.6 mm (Donaldson P550934: 72 mm, WIX 51287: 69.44 mm).
Gasket ID differs by 0.3 mm (Donaldson P550934: 62 mm, WIX 51287: 61.72 mm).
Donaldson P550934 is 13.4 mm taller (Donaldson P550934: 136 mm, WIX 51287: 122.6 mm) -- check clearance before substituting.
Can OD differs by 18.8 mm (Donaldson P550934: 93 mm, WIX 51287: 74.19 mm).
Both open their bypass valve in a comparable range: Donaldson P550934 at 8-11 psi, WIX 51287 at 12-15 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.