The Honda Inverter EU2200i requires 0.6 quarts (0.57 liters) of oil.
It's important to use the recommended oil type for your generator, which is Honda GN 4-stroke oil or an equivalent with the same API classification (API SF, SG, or SH).
Always check your owner's manual for the most up-to-date information on oil capacity and specifications.
The EU2200i has a dipstick to help you check the oil level.
Remember to change the oil regularly, as recommended in the owner's manual.