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