NAPA Gold 1580 vs FRAM PH9739: Oil Filter Compatibility
Compare NAPA Gold 1580 and FRAM PH9739 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.
NAPA Gold 1580 and FRAM PH9739 specifications
How matching is scored| Specification | NAPA Gold 1580 | FRAM PH9739 |
|---|---|---|
| Thread size | M20x1.5 | M20X1,5 |
| Gasket OD | 72 mm | 71 mm |
| Gasket ID | 63 mm | 61 mm |
| Can OD | 93.04 mm | 68 mm |
| Height | 96.82 mm | 100 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 8 - 11 | 12 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are M20x1.5.
Gasket OD differs by 1 mm (NAPA Gold 1580: 72 mm, FRAM PH9739: 71 mm).
Gasket ID differs by 2 mm (NAPA Gold 1580: 63 mm, FRAM PH9739: 61 mm).
FRAM PH9739 is 3.2 mm taller (NAPA Gold 1580: 96.82 mm, FRAM PH9739: 100 mm) -- check clearance before substituting.
Can OD differs by 25 mm (NAPA Gold 1580: 93.04 mm, FRAM PH9739: 68 mm).
Both open their bypass valve in a comparable range: NAPA Gold 1580 at 8-11 psi, FRAM PH9739 at 12-12 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.