Mobil 1 (ExxonMobil / Mann+Hummel) M1-303A vs WIX 51620: Oil Filter Compatibility
Compare Mobil 1 (ExxonMobil / Mann+Hummel) M1-303A and WIX 51620 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
Both use a 13/16-16 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.
Mobil 1 (ExxonMobil / Mann+Hummel) M1-303A and WIX 51620 specifications
How matching is scored| Specification | Mobil 1 (ExxonMobil / Mann+Hummel) M1-303A | WIX 51620 |
|---|---|---|
| Thread size | 13/16-16 | 13/16-16 |
| Gasket OD | 88 mm | 87.48 mm |
| Gasket ID | 79 mm | 78.74 mm |
| Can OD | 93.73 mm | 93.75 mm |
| Height | 136.65 mm | 132 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 12 - 15 | 8 - 11 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are 13/16-16.
Gasket OD differs by 0.5 mm (Mobil 1 (ExxonMobil / Mann+Hummel) M1-303A: 88 mm, WIX 51620: 87.48 mm).
Gasket ID differs by 0.3 mm (Mobil 1 (ExxonMobil / Mann+Hummel) M1-303A: 79 mm, WIX 51620: 78.74 mm).
Mobil 1 (ExxonMobil / Mann+Hummel) M1-303A is 4.7 mm taller (Mobil 1 (ExxonMobil / Mann+Hummel) M1-303A: 136.65 mm, WIX 51620: 132 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, WIX 51620 at 8-11 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.