Fleetguard LF3912 vs Fleetguard LF3451: Oil Filter Compatibility
Compare Fleetguard LF3912 and Fleetguard LF3451 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: 23.8 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 LF3912 and Fleetguard LF3451 specifications
How matching is scored| Specification | Fleetguard LF3912 | Fleetguard LF3451 |
|---|---|---|
| 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 | 127 mm | 142 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 12.5 | 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.
Fleetguard LF3451 is 15 mm taller (Fleetguard LF3912: 127 mm, Fleetguard LF3451: 142 mm) -- check clearance before substituting.
Can OD is identical at 94 mm.
Both open their bypass valve in a comparable range: Fleetguard LF3912 at 12.5-12.5 psi, Fleetguard LF3451 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.