Engine oil is used for lubrication and cooling, so it is gradually consumed during driving the vehicle.
Regularly check and manage the oil level using the following procedure.

Smartstream G2.5

Smartstream G3.5

Be sure the vehicle is on level ground.

Start the engine and allow it to reach normal operating temperature.

Turn the engine off and wait for a few minutes (about 15 minutes (with oil filler cap and dipstick detached)) for the oil to return to the oil pan.

Pull the dipstick out, wipe it clean, and re-insert it fully.

Warning

Radiator hose

Be very careful not to touch the radiator hose when checking or adding the engine oil as it may be hot enough to burn you.

Pull the dipstick out again and check the level. Check if the oil level is between the F-L line must refill it if the oil level is below the L line.

Caution

Do not overfill the engine oil. It may damage the engine.
Do not spill engine oil, when adding or changing engine oil. If you drop the engine oil on the engine room, wipe it off immediately.
When you wipe the oil level gauge, you should wipe it with a clean cloth. When mixed with debris, it can cause engine damage.

Smartstream G2.5

Smartstream G3.5

Use a funnel to help prevent oil from being spilled on engine components.

Use only the specified engine oil. (Refer to More Details.)

The engine oil consumption may increase while you break in a new vehicle and it will be stabilized after driving 6,000 km (4,000 miles).
The engine oil consumption can be affected by driving habits, climate conditions, traffic conditions, oil quality, etc. Therefore, it is recommended that you inspect the engine oil level regularly and refill it if necessary.
The engine oil change interval is set for the purpose of preventing oil deterioration, and is not related the amount of oil consumption; so, check and refill the amount of the oil regularly.