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:
Model plate
The plate is to be found on the front crossmember of the engine compartment and
bears the following identification data:
A - Manufacturer’ name.
B - Homologation number.
C - Vehicle type code.
...
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 ...
Periodic Safety Checks You Should Make OutsideThe Vehicle
Tires
Examine tires for excessive tread wear and uneven wear patterns. Check for stones,
nails, glass, or other objects lodged in the tread or sidewall. Inspect the tread
for cuts and cracks. Ins ...