Bosch 3331 vs FRAM PH3387A: Oil Filter Compatibility
Compare Bosch 3331 and FRAM PH3387A 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 M18x1.5 thread.
Quick verdict
Both use a M18x1.5 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.
Bosch 3331 and FRAM PH3387A specifications
How matching is scored| Specification | Bosch 3331 | FRAM PH3387A |
|---|---|---|
| Thread size | M18x1.5 | M18X1,5 |
| Gasket OD | 71 mm | 69.85 mm |
| Gasket ID | 62 mm | 62.71 mm |
| Can OD | 75.01 mm | 75.79 mm |
| Height | 85.34 mm | 85.32 mm |
| Internal bypass valve | No | No |
| Bypass PSID | Not applicable | Not applicable |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are M18x1.5.
Gasket OD differs by 1.2 mm (Bosch 3331: 71 mm, FRAM PH3387A: 69.85 mm).
Gasket ID differs by 0.7 mm (Bosch 3331: 62 mm, FRAM PH3387A: 62.71 mm).
Height is identical at 85.34 mm.
Can OD differs by 0.8 mm (Bosch 3331: 75.01 mm, FRAM PH3387A: 75.79 mm).
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.