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:
28. Tachometer
The white area of the scale shows the permissible engine revolutions-per-minute
(RPM x 1000) for each gear range.
Before reaching the red area, ease up on the accelerator to prevent engine damage. ...
Engine coolant temperature gauge
This shows the temperature of the engine coolant fluid and begins working when
the fluid temperature exceeds approx. 50°C.
Under normal conditions, the needle should hover around the middle of the ...
Low engine oil pressure
(red)
EXHAUST OIL
(Multijet versions) (red)
Low engine oil pressure
Turning the ignition key to MAR the warning light turns on, but it should go
out as soon as the engine is started.
On certa ...