NAPA Gold 1575 vs FRAM PH4703: Oil Filter Compatibility
Compare NAPA Gold 1575 and FRAM PH4703 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
Closest known dimensional difference: height -14.4 mm. Verify application-specific requirements before substituting.
- 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 1575 and FRAM PH4703 specifications
How matching is scored| Specification | NAPA Gold 1575 | FRAM PH4703 |
|---|---|---|
| Thread size | M20x1.5 | M20X1,5 |
| Gasket OD | 72 mm | 71.1 mm |
| Gasket ID | 63 mm | 62.5 mm |
| Can OD | 82.14 mm | 86 mm |
| Height | 103.4 mm | 89 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 16 | 12 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are M20x1.5.
Gasket OD differs by 0.9 mm (NAPA Gold 1575: 72 mm, FRAM PH4703: 71.1 mm).
Gasket ID differs by 0.5 mm (NAPA Gold 1575: 63 mm, FRAM PH4703: 62.5 mm).
NAPA Gold 1575 is 14.4 mm taller (NAPA Gold 1575: 103.4 mm, FRAM PH4703: 89 mm) -- check clearance before substituting.
Can OD differs by 3.9 mm (NAPA Gold 1575: 82.14 mm, FRAM PH4703: 86 mm).
Both open their bypass valve in a comparable range: NAPA Gold 1575 at 16-16 psi, FRAM PH4703 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.