Baldwin B358 vs FRAM PH43: Oil Filter Compatibility
Compare Baldwin B358 and FRAM PH43 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
Large bypass PSI mismatch: 10 psi · 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 B358 and FRAM PH43 specifications
How matching is scored| Specification | Baldwin B358 | FRAM PH43 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 71.4 mm | 71.1 mm |
| Gasket ID | 62.7 mm | 62.5 mm |
| Can OD | 93.7 mm | 93.7 mm |
| Height | 111.1 mm | 111.1 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 2 | 12 |
| Anti-drainback valve | No | Yes |
What matters in this specific comparison
Thread size matches: both are 3/4-16.
Gasket OD differs by 0.3 mm (Baldwin B358: 71.4 mm, FRAM PH43: 71.1 mm).
Gasket ID differs by 0.2 mm (Baldwin B358: 62.7 mm, FRAM PH43: 62.5 mm).
Height is identical at 111.1 mm.
Can OD is identical at 93.7 mm.
Both open their bypass valve in a comparable range: Baldwin B358 at 2-2 psi, FRAM PH43 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.