Baldwin B404 vs NAPA Gold 1525: Oil Filter Compatibility
Compare Baldwin B404 and NAPA Gold 1525 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.
Baldwin B404 and NAPA Gold 1525 specifications
How matching is scored| Specification | Baldwin B404 | NAPA Gold 1525 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 71.4 mm | 72 mm |
| Gasket ID | 62.7 mm | 63 mm |
| Can OD | 118.3 mm | 74.9 mm |
| Height | 158.8 mm | 148.4 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 0.6 mm (Baldwin B404: 71.4 mm, NAPA Gold 1525: 72 mm).
Gasket ID differs by 0.3 mm (Baldwin B404: 62.7 mm, NAPA Gold 1525: 63 mm).
Baldwin B404 is 10.4 mm taller (Baldwin B404: 158.8 mm, NAPA Gold 1525: 148.4 mm) -- check clearance before substituting.
Can OD differs by 43.4 mm (Baldwin B404: 118.3 mm, NAPA Gold 1525: 74.9 mm).
Bypass valve presence differs: NAPA Gold 1525 has one, Baldwin B404 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.