Mobil 1 (ExxonMobil / Mann+Hummel) M1-303A vs Baldwin BT259: Oil Filter Compatibility
Compare Mobil 1 (ExxonMobil / Mann+Hummel) M1-303A and Baldwin BT259 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 13/16-16 thread.
Quick verdict
Large bypass PSI mismatch: 6.5 psi · Candidate removes 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.
Mobil 1 (ExxonMobil / Mann+Hummel) M1-303A and Baldwin BT259 specifications
How matching is scored| Specification | Mobil 1 (ExxonMobil / Mann+Hummel) M1-303A | Baldwin BT259 |
|---|---|---|
| Thread size | 13/16-16 | 13/16-16 |
| Gasket OD | 88 mm | 91 mm |
| Gasket ID | 79 mm | 80 mm |
| Can OD | 93.73 mm | 93.7 mm |
| Height | 136.65 mm | 137.3 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 12 - 15 | 20 |
| Anti-drainback valve | Yes | No |
What matters in this specific comparison
Thread size matches: both are 13/16-16.
Gasket OD differs by 3 mm (Mobil 1 (ExxonMobil / Mann+Hummel) M1-303A: 88 mm, Baldwin BT259: 91 mm).
Gasket ID differs by 1 mm (Mobil 1 (ExxonMobil / Mann+Hummel) M1-303A: 79 mm, Baldwin BT259: 80 mm).
Baldwin BT259 is 0.7 mm taller (Mobil 1 (ExxonMobil / Mann+Hummel) M1-303A: 136.65 mm, Baldwin BT259: 137.3 mm) -- check clearance before substituting.
Can OD is identical at 93.73 mm.
Both open their bypass valve in a comparable range: Mobil 1 (ExxonMobil / Mann+Hummel) M1-303A at 12-15 psi, Baldwin BT259 at 20-20 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.