Baldwin BT347 vs MAHLE OC 47: Oil Filter Compatibility
Compare Baldwin BT347 and MAHLE OC 47 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
Closest known dimensional difference: height -67 mm. Verify application-specific requirements before substituting.
- 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 BT347 and MAHLE OC 47 specifications
How matching is scored| Specification | Baldwin BT347 | MAHLE OC 47 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 71.4 mm | 72 mm |
| Gasket ID | 62.7 mm | 62 mm |
| Can OD | 108 mm | 76 mm |
| Height | 186.5 mm | 119.5 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 30 | 32 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are 3/4-16.
Gasket OD differs by 0.6 mm (Baldwin BT347: 71.4 mm, MAHLE OC 47: 72 mm).
Gasket ID differs by 0.7 mm (Baldwin BT347: 62.7 mm, MAHLE OC 47: 62 mm).
Baldwin BT347 is 67 mm taller (Baldwin BT347: 186.5 mm, MAHLE OC 47: 119.5 mm) -- check clearance before substituting.
Can OD differs by 32 mm (Baldwin BT347: 108 mm, MAHLE OC 47: 76 mm).
Both open their bypass valve in a comparable range: Baldwin BT347 at 30-30 psi, MAHLE OC 47 at 32-32 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.