Fleetguard LF3972 vs Fleetguard LF3934: Oil Filter Compatibility
Compare Fleetguard LF3972 and Fleetguard LF3934 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 1-16 thread.
Quick verdict
Bypass presence unknown on one or both filters · 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 LF3972 and Fleetguard LF3934 specifications
How matching is scored| Specification | Fleetguard LF3972 | Fleetguard LF3934 |
|---|---|---|
| Thread size | 1-16 UN-2B | 1-16 UN-2B |
| Gasket OD | 71.88 mm | 71.98 mm |
| Gasket ID | 62.48 mm | 62.53 mm |
| Can OD | 93 mm | 94 mm |
| Height | 177 mm | 176 mm |
| Internal bypass valve | No | Unknown |
| Bypass PSID | Not applicable | Unknown |
| Anti-drainback valve | No | Yes |
What matters in this specific comparison
Thread size matches: both are 1-16.
Gasket OD differs by 0.1 mm (Fleetguard LF3972: 71.88 mm, Fleetguard LF3934: 71.98 mm).
Gasket ID differs by 0.1 mm (Fleetguard LF3972: 62.48 mm, Fleetguard LF3934: 62.53 mm).
Fleetguard LF3972 is 1 mm taller (Fleetguard LF3972: 177 mm, Fleetguard LF3934: 176 mm) -- check clearance before substituting.
Can OD differs by 1 mm (Fleetguard LF3972: 93 mm, Fleetguard LF3934: 94 mm).
Anti-drainback valve differs: Fleetguard LF3934 has one, Fleetguard LF3972 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.