Donaldson P550227 vs WIX 51391: Oil Filter Compatibility
Compare Donaldson P550227 and WIX 51391 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
Candidate adds internal bypass; usually redundant with engine-mounted bypass · Candidate adds ADBV
- 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 P550227 and WIX 51391 specifications
How matching is scored| Specification | Donaldson P550227 | WIX 51391 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 63 mm | 62.87 mm |
| Gasket ID | 57 mm | 55.19 mm |
| Can OD | 84 mm | 82.14 mm |
| Height | 100 mm | 103.4 mm |
| Internal bypass valve | No | Yes |
| Bypass PSID | Not applicable | 13 - 19 |
| Anti-drainback valve | No | Yes |
What matters in this specific comparison
Thread size matches: both are 3/4-16.
Gasket OD differs by 0.1 mm (Donaldson P550227: 63 mm, WIX 51391: 62.87 mm).
Gasket ID differs by 1.8 mm (Donaldson P550227: 57 mm, WIX 51391: 55.19 mm).
WIX 51391 is 3.4 mm taller (Donaldson P550227: 100 mm, WIX 51391: 103.4 mm) -- check clearance before substituting.
Can OD differs by 1.9 mm (Donaldson P550227: 84 mm, WIX 51391: 82.14 mm).
Bypass valve presence differs: WIX 51391 has one, Donaldson P550227 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.