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 ...

Switching off the rear screens
Both of rear screens can be switched off from the front center control panel. This function can be activated under RSE settings Display off as explained in points 2-4 in the section " ...

Channel lock
Access to specific channels can be restricted (locked). A locked channel will not provide audio, song titles, or artist information. NOTE All channels are initially unlocked. Locking a channel ...