Fleetguard LF3400 vs Fleetguard LF3378: Oil Filter Compatibility
Compare Fleetguard LF3400 and Fleetguard LF3378 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 3/4-16 thread.
Quick verdict
Large bypass PSI mismatch: 26.8 psi
- 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 LF3400 and Fleetguard LF3378 specifications
How matching is scored| Specification | Fleetguard LF3400 | Fleetguard LF3378 |
|---|---|---|
| Thread size | 3/4-16 UNF-2B | 3/4-16 UNF-2B |
| Gasket OD | 71.98 mm | 71.98 mm |
| Gasket ID | 62.53 mm | 62.53 mm |
| Can OD | 94 mm | 94 mm |
| Height | 92 mm | 92 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 9.43 | 36.26 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are 3/4-16.
Gasket OD is identical at 71.98 mm.
Gasket ID is identical at 62.53 mm.
Height is identical at 92 mm.
Can OD is identical at 94 mm.
Both open their bypass valve in a comparable range: Fleetguard LF3400 at 9.43-9.43 psi, Fleetguard LF3378 at 36.26-36.26 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.