NAPA Gold 1391 vs Donaldson P550715: Oil Filter Compatibility
Compare NAPA Gold 1391 and Donaldson P550715 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 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.
NAPA Gold 1391 and Donaldson P550715 specifications
How matching is scored| Specification | NAPA Gold 1391 | Donaldson P550715 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 63 mm | 66 mm |
| Gasket ID | 55 mm | 57 mm |
| Can OD | 82.14 mm | 82 mm |
| Height | 103.4 mm | 112 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 13 - 19 | 15 - 19 |
| Anti-drainback valve | Yes | No |
What matters in this specific comparison
Thread size matches: both are 3/4-16.
Gasket OD differs by 3 mm (NAPA Gold 1391: 63 mm, Donaldson P550715: 66 mm).
Gasket ID differs by 2 mm (NAPA Gold 1391: 55 mm, Donaldson P550715: 57 mm).
Donaldson P550715 is 8.6 mm taller (NAPA Gold 1391: 103.4 mm, Donaldson P550715: 112 mm) -- check clearance before substituting.
Can OD differs by 0.1 mm (NAPA Gold 1391: 82.14 mm, Donaldson P550715: 82 mm).
Both open their bypass valve in a comparable range: NAPA Gold 1391 at 13-19 psi, Donaldson P550715 at 15-19 psi.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.