Fleetguard LF3788 vs FRAM P1655: Oil Filter Compatibility
Compare Fleetguard LF3788 and FRAM P1655 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 · ADBV 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 LF3788 and FRAM P1655 specifications
How matching is scored| Specification | Fleetguard LF3788 | FRAM P1655 |
|---|---|---|
| Thread size | 1-12 UNF-2B | 1"-12UNF |
| Gasket OD | 71.98 mm | 71.1 mm |
| Gasket ID | 62.53 mm | 62.5 mm |
| Can OD | 94 mm | 94 mm |
| Height | 138 mm | 133.4 mm |
| Internal bypass valve | Unknown | Yes |
| Bypass PSID | 22.04 | 12 |
| Anti-drainback valve | Unknown | Yes |
What matters in this specific comparison
Thread size matches: both are 1-12.
Gasket OD differs by 0.9 mm (Fleetguard LF3788: 71.98 mm, FRAM P1655: 71.1 mm).
Gasket ID is identical at 62.53 mm.
Fleetguard LF3788 is 4.6 mm taller (Fleetguard LF3788: 138 mm, FRAM P1655: 133.4 mm) -- check clearance before substituting.
Can OD is identical at 94 mm.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.