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
1.28V versions
1.3 Multijet versions
Checking engine oil
Check the oil level a few minutes (about 5) after the engine has stopped, with
the car parked on level ground.
Check that the level i ...
Coin tray
A coin tray may be found on the dashboard on the central tunnel according to
the versions. ...
Injection system failure
(Multijet versions - amber)
EOBD SYSTEM FAILURE
(petrol versions - amber)
Injection system failure
Turning the ignition key to MAR the warning light turns on but it should go off
after engine ...