Baldwin BT389 vs WIX 51801: Oil Filter Compatibility
Compare Baldwin BT389 and WIX 51801 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 11/2-16 thread.
Quick verdict
Candidate adds internal bypass; usually redundant with engine-mounted bypass · Candidate adds ADBV
- 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 BT389 and WIX 51801 specifications
How matching is scored| Specification | Baldwin BT389 | WIX 51801 |
|---|---|---|
| Thread size | 11/2-16 | 11/2-16 |
| Gasket OD | 110.3 mm | 109.7 mm |
| Gasket ID | 98.4 mm | 97.03 mm |
| Can OD | 128.6 mm | 135.7 mm |
| Height | 273.1 mm | 252.3 mm |
| Internal bypass valve | No | Yes |
| Bypass PSID | Not applicable | 12 - 15 |
| Anti-drainback valve | No | Yes |
What matters in this specific comparison
Thread size matches: both are 11/2-16.
Gasket OD differs by 0.6 mm (Baldwin BT389: 110.3 mm, WIX 51801: 109.7 mm).
Gasket ID differs by 1.4 mm (Baldwin BT389: 98.4 mm, WIX 51801: 97.03 mm).
Baldwin BT389 is 20.8 mm taller (Baldwin BT389: 273.1 mm, WIX 51801: 252.3 mm) -- check clearance before substituting.
Can OD differs by 7.1 mm (Baldwin BT389: 128.6 mm, WIX 51801: 135.7 mm).
Bypass valve presence differs: WIX 51801 has one, Baldwin BT389 does not.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.