Baldwin BD28 vs FRAM PH8933: Oil Filter Compatibility
Compare Baldwin BD28 and FRAM PH8933 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 M26x1.5 thread.
Quick verdict
Large bypass PSI mismatch: 8 psi
- 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 BD28 and FRAM PH8933 specifications
How matching is scored| Specification | Baldwin BD28 | FRAM PH8933 |
|---|---|---|
| Thread size | M26x1.5 | M26X1,5 |
| Gasket OD | 71.4 mm | 72 mm |
| Gasket ID | 62.7 mm | 62 mm |
| Can OD | 93.7 mm | 93 mm |
| Height | 136.5 mm | 142 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 20 | 12 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are M26x1.5.
Gasket OD differs by 0.6 mm (Baldwin BD28: 71.4 mm, FRAM PH8933: 72 mm).
Gasket ID differs by 0.7 mm (Baldwin BD28: 62.7 mm, FRAM PH8933: 62 mm).
FRAM PH8933 is 5.5 mm taller (Baldwin BD28: 136.5 mm, FRAM PH8933: 142 mm) -- check clearance before substituting.
Can OD differs by 0.7 mm (Baldwin BD28: 93.7 mm, FRAM PH8933: 93 mm).
Both open their bypass valve in a comparable range: Baldwin BD28 at 20-20 psi, FRAM PH8933 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.