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:
Transmission
Modifications or repairs to the fuel system that are not carried out properly
or do not take the system’s technical specifications into account can cause malfunctions
leading to the risk of fire ...
Boot light
To change the bulb, proceed as follows:
❒ remove the lens (A) as shown by the arrow;
❒ lift protection (B) and remove the bulb (clipped in).
...
Fluids and lubricants
PRODUCTS WHICH MAY BE USED AND THEIR CHARACTERISTICS
(*) For very low temperatures, we recommend SELENIA MULTIPOWER.
(**) For very low temperatures, we recommend SELENIA WR. ...