The Honda FourTrax Foreman 400 normally requires about 2 quarts of engine oil when you change the oil and replace the filter. Exact capacity depends on the model year and whether the filter is being replaced, so consult your owner's manual for the precise figure.
Oil capacity by year and filter changes
Oil capacity can vary slightly by model year and whether you replace the oil filter. Use this as a general guide and verify with your manual for your exact year and configuration.
- With a new oil filter: about 2.0–2.1 quarts (1.9–2.0 L).
- Without changing the filter: about 1.8–1.9 quarts (1.7–1.8 L).
In practice, the full-fill amount is best confirmed with the dipstick after warming the engine and allowing the oil to settle, then topping off to the full mark if needed.
Recommended oil type and change considerations
Use oil that meets Honda's specifications for the Foreman 400. The following guidance covers typical usage, but always refer to your manual for the exact specification and intervals.
- Conventional motorcycle/ATV oil in 10W-40 is commonly recommended for most temperatures.
- Full synthetic 10W-40 or 5W-40 can be used if it meets the API/ACEA specs and Honda's approvals; follow your manual for any restrictions.
Always replace the oil filter when performing an oil change to ensure proper filtration and capacity accuracy, and recheck the oil level after the engine has run and cooled.
Summary
For the Honda Foreman 400, plan on roughly 2 quarts of engine oil when performing an oil change with a new filter, with small variations by year. Check the owner's manual and use the recommended oil type and viscosity for your climate. Always verify the level after startup and warm-up to avoid overfill or underfill.