MAHLE OC 25 vs Bosch 3402: Oil Filter Compatibility
Compare MAHLE OC 25 and Bosch 3402 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: 20 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.
MAHLE OC 25 and Bosch 3402 specifications
How matching is scored| Specification | MAHLE OC 25 | Bosch 3402 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 71 mm | 71 mm |
| Gasket ID | 61.7 mm | 62 mm |
| Can OD | 93.98 mm | 94.01 mm |
| Height | 98.55 mm | 95.25 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 32 | 8 - 16 |
| 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 differs by 0.3 mm (MAHLE OC 25: 61.7 mm, Bosch 3402: 62 mm).
MAHLE OC 25 is 3.3 mm taller (MAHLE OC 25: 98.55 mm, Bosch 3402: 95.25 mm) -- check clearance before substituting.
Can OD is identical at 93.98 mm.
Both open their bypass valve in a comparable range: MAHLE OC 25 at 32-32 psi, Bosch 3402 at 8-16 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.