Fleetguard LF3812 vs WIX 51301: Oil Filter Compatibility
Compare Fleetguard LF3812 and WIX 51301 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 M20x1.5 thread.
Quick verdict
Bypass presence unknown on one or both filters · ADBV unknown on one or both filters
- 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.
Fleetguard LF3812 and WIX 51301 specifications
How matching is scored| Specification | Fleetguard LF3812 | WIX 51301 |
|---|---|---|
| Thread size | M20 X 1.5 | M20x1.5 |
| Gasket OD | 63.5 mm | 63.25 mm |
| Gasket ID | 50.5 mm | 51.05 mm |
| Can OD | 81 mm | 82.35 mm |
| Height | 103 mm | 81.13 mm |
| Internal bypass valve | Unknown | Yes |
| Bypass PSID | 23 | 8 - 11 |
| Anti-drainback valve | Unknown | Yes |
What matters in this specific comparison
Thread size matches: both are M20x1.5.
Gasket OD differs by 0.3 mm (Fleetguard LF3812: 63.5 mm, WIX 51301: 63.25 mm).
Gasket ID differs by 0.5 mm (Fleetguard LF3812: 50.5 mm, WIX 51301: 51.05 mm).
Fleetguard LF3812 is 21.9 mm taller (Fleetguard LF3812: 103 mm, WIX 51301: 81.13 mm) -- check clearance before substituting.
Can OD differs by 1.3 mm (Fleetguard LF3812: 81 mm, WIX 51301: 82.35 mm).
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.