All gasoline sold in the United States is required to contain effective detergent additives. Use of additional detergents or other additives is not needed under normal conditions and would result in additional cost. Therefore you should not have to add anything to the fuel.
See also:
Engine Oil
Checking Oil Level
To assure proper engine lubrication, the engine oil must be maintained at the
correct level. Check the oil level at regular intervals, such as every fuel stop.
The best time to ...
Audio repetition (Audio Rpt.) (where provided)
With this function the display repeats information relevant to the Radio (selected
radio station frequency or RDS message, automatic tuning or AutoSTore), audio CD
(track number).
...
Speedlock (Door Lock) (where provided)
This function:
❒ when activated (ON) locks automatically the doors when the car speed exceeds
20 km/h;
❒ when deactivated (OFF) doesn’t perform automatic door lock when the car speed ...