Fleetguard LF3618 vs FRAM PH3757: Oil Filter Compatibility
Compare Fleetguard LF3618 and FRAM PH3757 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.
Quick verdict
Moderate gasket sealing overlap · Large gasket OD variation
- 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 LF3618 and FRAM PH3757 specifications
| Specification | Fleetguard LF3618 | FRAM PH3757 |
|---|---|---|
| Thread size | 11/2-16UNF-2B | 1"1/2-16 |
| Gasket OD | 105.4 mm | 103.12 mm |
| Gasket ID | 94.6 mm | 97.79 mm |
| Can OD | 115 mm | 118.36 mm |
| Height | 199 mm | 205.74 mm |
| Internal bypass valve | No | Yes |
| Bypass PSID | Unknown | 12 |
| Anti-drainback valve | No | Yes |
What matters most in this comparison?
Thread match: A direct spin-on substitute starts with the same thread size. If the threads differ, the comparison stops there.
Gasket fit: Even when thread size matches, the gasket outside diameter and inside diameter still control whether the filter seals safely against the mounting surface.
Height difference: Small height differences may be acceptable, but longer filters can create clearance problems in tighter installations.
Valve behavior: Bypass and anti-drainback differences can matter in real-world service, especially on cold start or in applications sensitive to oil drain-back.
Related filter pages
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.