See also:

Fuel Formulations
Do not use gasoline that contains lead as a knock inhibitor, and do not use lead additives. Besides damaging the exhaust emission control systems on your vehicle, lead has been strongly linked ...

Deposit control gasoline (detergent additives)
Volvo recommends the use of detergent gasoline to control engine deposits. Detergent gasoline is effective in keeping injectors and intake valves clean. Consistent use of deposit control gasol ...

Driving Impressions
Even when equipped with the automatic transmission, the S40 2.4i accelerates with spirit, though the engine growls when pushed. Despite a taut suspension, ride comfort is generally satisfactory, b ...