FRAM HP1 vs Donaldson P550008: Oil Filter Compatibility
Compare FRAM HP1 and Donaldson P550008 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
Both use a 3/4-16 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.
FRAM HP1 and Donaldson P550008 specifications
How matching is scored| Specification | FRAM HP1 | Donaldson P550008 |
|---|---|---|
| Thread size | 3/4"-16 | 3/4-16 |
| Gasket OD | 71 mm | 72.4 mm |
| Gasket ID | 61 mm | 62 mm |
| Can OD | 95 mm | 93 mm |
| Height | 143 mm | 136 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 22 | 12 - 15 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are 3/4-16.
Gasket OD differs by 1.4 mm (FRAM HP1: 71 mm, Donaldson P550008: 72.4 mm).
Gasket ID differs by 1 mm (FRAM HP1: 61 mm, Donaldson P550008: 62 mm).
FRAM HP1 is 7 mm taller (FRAM HP1: 143 mm, Donaldson P550008: 136 mm) -- check clearance before substituting.
Can OD differs by 2 mm (FRAM HP1: 95 mm, Donaldson P550008: 93 mm).
Both open their bypass valve in a comparable range: FRAM HP1 at 22-22 psi, Donaldson P550008 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.