Fleetguard LF3656 vs Fleetguard LF673: Oil Filter Compatibility
Compare Fleetguard LF3656 and Fleetguard LF673 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 1-12 thread.
Quick verdict
Bypass presence unknown on one or both filters · Candidate removes 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 LF3656 and Fleetguard LF673 specifications
How matching is scored| Specification | Fleetguard LF3656 | Fleetguard LF673 |
|---|---|---|
| Thread size | 1-12 UNF-2B | 1-12 UNF-2B |
| Gasket OD | 71.63 mm | 71.88 mm |
| Gasket ID | 62.59 mm | 62.48 mm |
| Can OD | 108 mm | 95 mm |
| Height | 206 mm | 203 mm |
| Internal bypass valve | Unknown | No |
| Bypass PSID | 19.87 | Not applicable |
| Anti-drainback valve | Yes | No |
What matters in this specific comparison
Thread size matches: both are 1-12.
Gasket OD differs by 0.3 mm (Fleetguard LF3656: 71.63 mm, Fleetguard LF673: 71.88 mm).
Gasket ID differs by 0.1 mm (Fleetguard LF3656: 62.59 mm, Fleetguard LF673: 62.48 mm).
Fleetguard LF3656 is 3 mm taller (Fleetguard LF3656: 206 mm, Fleetguard LF673: 203 mm) -- check clearance before substituting.
Can OD differs by 13 mm (Fleetguard LF3656: 108 mm, Fleetguard LF673: 95 mm).
Anti-drainback valve differs: Fleetguard LF3656 has one, Fleetguard LF673 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.