Fleetguard LF779 vs WIX 51040: Oil Filter Compatibility
Compare Fleetguard LF779 and WIX 51040 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 M18x1.5 thread.
Quick verdict
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.
Fleetguard LF779 and WIX 51040 specifications
How matching is scored| Specification | Fleetguard LF779 | WIX 51040 |
|---|---|---|
| Thread size | M18x1.5 | M18x1.5 |
| Gasket OD | 71.88 mm | 69.44 mm |
| Gasket ID | 62.48 mm | 61.72 mm |
| Can OD | 76 mm | 74.19 mm |
| Height | 117 mm | 87.6 mm |
| Internal bypass valve | No | No |
| Bypass PSID | Not applicable | Not applicable |
| Anti-drainback valve | No | Yes |
What matters in this specific comparison
Thread size matches: both are M18x1.5.
Gasket OD differs by 2.4 mm (Fleetguard LF779: 71.88 mm, WIX 51040: 69.44 mm).
Gasket ID differs by 0.8 mm (Fleetguard LF779: 62.48 mm, WIX 51040: 61.72 mm).
Fleetguard LF779 is 29.4 mm taller (Fleetguard LF779: 117 mm, WIX 51040: 87.6 mm) -- check clearance before substituting.
Can OD differs by 1.8 mm (Fleetguard LF779: 76 mm, WIX 51040: 74.19 mm).
Anti-drainback valve differs: WIX 51040 has one, Fleetguard LF779 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.