Volvo S80 Owner's Manual page 123

Fuel adaptation
Flexifuel engines can be driven on both 95
octane unleaded petrol and bioethanol E85.
Both fuels are filled in the common fuel tank
so that any variations of mixing ratios
between these two fuels is possible.
If the fuel tank is filled with petrol after the car
has been driven on bioethanol E85 (or vice
versa) then the engine may run slightly
unevenly for a time. For this reason it is
important to allow the engine to accustom
itself (adapt) to the new fuel mixture.
Adaptation takes place automatically when
the car is driven for a short period at an even
speed.
IMPORTANT
After the fuel mixture in the tank has been
changed an adaptation should be made by
driving at an even speed for about 15
minutes.
If the battery has been discharged or discon-
nected then a slightly longer period of driving
is required for the adaptation as the memory
for the electronics has been cleared.
03 Your driving environment
Starting the engine – Flexifuel
03
121