See also:

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 gasolines ...

C30 Changes and Models
Sharp-eyed folks will notice that the C30 has been redesigned for 2011. Changes include a new hood, front fenders, headlights and grille. (Check out the changes for yourself here.) The rest of the ...

Auto
The function automatically regulates cooling, heating, blower speed, recirculation, and air distribution to maintain the chosen temperature. If you select one or more manual functions, th ...