Bosch 3400 vs K&N HP-2004: Oil Filter Compatibility
Compare Bosch 3400 and K&N HP-2004 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
RISKY
Both use a 3/4-16 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 3400 and K&N HP-2004 specifications
How matching is scored| Specification | Bosch 3400 | K&N HP-2004 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 71 mm | 71 mm |
| Gasket ID | 62 mm | 62 mm |
| Can OD | 76 mm | 93 mm |
| Height | 102.11 mm | 104 mm |
| Internal bypass valve | No | Unknown |
| Bypass PSID | Not applicable | 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 71 mm.
Gasket ID is identical at 62 mm.
K&N HP-2004 is 1.9 mm taller (Bosch 3400: 102.11 mm, K&N HP-2004: 104 mm) -- check clearance before substituting.
Can OD differs by 17 mm (Bosch 3400: 76 mm, K&N HP-2004: 93 mm).
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.