Fleetguard LF3918 vs Bosch 3331: Oil Filter Compatibility
Compare Fleetguard LF3918 and Bosch 3331 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
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 LF3918 and Bosch 3331 specifications
| Specification | Fleetguard LF3918 | Bosch 3331 |
|---|---|---|
| Thread size | M18x1.5 | M18x1.5 |
| Gasket OD | 70.1 mm | 71 mm |
| Gasket ID | 62.5 mm | 62 mm |
| Can OD | 93 mm | 75.01 mm |
| Height | 176 mm | 85.34 mm |
| Internal bypass valve | No | No |
| Bypass PSID | Not applicable | Not applicable |
| 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
- Fleetguard LF3918 oil filter cross reference
- Bosch 3331 oil filter cross reference
- WIX 51040 oil filter cross reference
- WIX 51040MP oil filter cross reference
- Fleetguard LF779 oil filter cross reference
- Fleetguard LF780 oil filter cross reference
- Champ PH47 oil filter cross reference
- WIX 51036MP oil filter cross reference
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.