Fleetguard LF551A vs Fleetguard LF3339: Oil Filter Compatibility
Compare Fleetguard LF551A and Fleetguard LF3339 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
Both use a 3/4-16 thread.
- 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 LF551A and Fleetguard LF3339 specifications
How matching is scored| Specification | Fleetguard LF551A | Fleetguard LF3339 |
|---|---|---|
| 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 | 96 mm | 78 mm |
| Height | 137 mm | 116 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 10.01 | 7.98 |
| 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 LF551A is 21 mm taller (Fleetguard LF551A: 137 mm, Fleetguard LF3339: 116 mm) -- check clearance before substituting.
Can OD differs by 18 mm (Fleetguard LF551A: 96 mm, Fleetguard LF3339: 78 mm).
Both open their bypass valve in a comparable range: Fleetguard LF551A at 10.01-10.01 psi, Fleetguard LF3339 at 7.98-7.98 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.