Bosch 3325 vs K&N HP-1003: Oil Filter Compatibility
Compare Bosch 3325 and K&N HP-1003 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
Bypass presence unknown on one or both filters
- 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 3325 and K&N HP-1003 specifications
How matching is scored| Specification | Bosch 3325 | K&N HP-1003 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 63 mm | 63 mm |
| Gasket ID | 52 mm | 52 mm |
| Can OD | 68 mm | 70 mm |
| Height | 89.41 mm | 84 mm |
| Internal bypass valve | Yes | Unknown |
| Bypass PSID | 12 - 15 | Unknown |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are 3/4-16.
Gasket OD is identical at 63 mm.
Gasket ID is identical at 52 mm.
Bosch 3325 is 5.4 mm taller (Bosch 3325: 89.41 mm, K&N HP-1003: 84 mm) -- check clearance before substituting.
Can OD differs by 2 mm (Bosch 3325: 68 mm, K&N HP-1003: 70 mm).
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.