For the Honda BF5.5 outboard (5.5 horsepower, four-stroke), the crankcase oil capacity is about 0.42 quarts (roughly 0.4 liters). The gearcase holds a separate ~0.2 quarts. Exact figures depend on the specific model and year.
Oil capacity by component
The figures below reflect typical capacities you’ll encounter on common Honda 5.5 models. Always verify with your exact unit’s manual.
- Engine oil capacity (crankcase): about 0.4 US quarts (roughly 0.38–0.44 qt), i.e., around 0.4 liters.
- Gearcase oil capacity (lower unit): about 0.2 US quarts (roughly 0.15–0.25 liters, depending on model).
These figures cover the typical crankcase and gearcase oil volumes for 4-stroke Honda 5.5 HP outboards. Always check the exact spec for your engine variant.
How to confirm the exact capacity for your model
The most reliable way to know your engine’s oil capacity is to consult the official documentation or contact a dealer.
- Find your exact model and year number (for example, BF5.5D or BF5.5A) on the identification plate or in the manual.
- Consult the owner’s manual or the Honda Marine service information for that variant to confirm crankcase and gearcase capacities.
- Check Honda’s official website or contact a local Honda Marine dealer if you’re unsure.
- When performing an oil change, fill to the recommended level on the dipstick or oil mark as specified in the manual.
- Use the recommended oil type (see below) for optimal protection and performance.
Having the exact capacity helps prevent overfilling, which can cause foaming or leaks, or underfilling, which compromises lubrication. Always use the specified oil type and follow the service intervals.
Oil type and maintenance tips
For most Honda 4-stroke outboards in the 5.5 HP class, the recommended oil is a multigrade 4-stroke marine oil that meets Honda’s specifications (commonly SAE 10W-30 or 5W-30, API service category SN or newer). Some owners use Honda GN-2 4-stroke outboard oil for reliability and compatibility. Check your manual for the exact grade and whether synthetic or mineral oil is preferred for your climate and usage.
Routine maintenance also includes checking the oil level with the dipstick while the engine is level and warm, replacing oil at intervals specified by Honda, and ensuring the lower-unit gear oil is changed as recommended. In saltwater environments, more frequent checks are advised.
Summary
In most Honda 5.5 HP four-stroke outboards, you’ll be dealing with roughly 0.4 quarts of engine oil in the crankcase and about 0.2 quarts for the gearcase. Exact amounts vary by model and year, so always verify with the owner’s manual or a Honda Marine dealer. Using the recommended oil type and following the maintenance schedule keeps the motor running smoothly and avoids lubrication issues.