Fleetguard LF3638 vs Fleetguard LF3728: Oil Filter Compatibility
Compare Fleetguard LF3638 and Fleetguard LF3728 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
Bypass presence unknown on one or both filters
- 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 LF3638 and Fleetguard LF3728 specifications
How matching is scored| Specification | Fleetguard LF3638 | Fleetguard LF3728 |
|---|---|---|
| Thread size | 3/4-16 UNF-2B | 3/4-16 UNF-2B |
| Gasket OD | 71.88 mm | 71.98 mm |
| Gasket ID | 62.53 mm | 62.53 mm |
| Can OD | 94 mm | 96 mm |
| Height | 127 mm | 137 mm |
| Internal bypass valve | No | Unknown |
| Bypass PSID | Not applicable | 10.01 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are 3/4-16.
Gasket OD differs by 0.1 mm (Fleetguard LF3638: 71.88 mm, Fleetguard LF3728: 71.98 mm).
Gasket ID is identical at 62.53 mm.
Fleetguard LF3728 is 10 mm taller (Fleetguard LF3638: 127 mm, Fleetguard LF3728: 137 mm) -- check clearance before substituting.
Can OD differs by 2 mm (Fleetguard LF3638: 94 mm, Fleetguard LF3728: 96 mm).
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.