Volvo S90 2019 Owner's Manual page 419

NOTE
When switching to higher octane fuel or
changing gasoline brands, it may be neces-
sary to fill the tank more than once before a
difference in engine operation is noticea-
ble.
Fuel Formulations
Do not use gasoline that contains lead or man-
ganese 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 to certain forms of
cancer.
Many fuels contain benzene as a solvent.
Unburned benzene has been strongly linked to
certain forms of cancer. If you live in an area
where you must fill your own gas tank, take
precautions. These may include:
standing upwind away from the filler noz-
•
zle while refueling
refueling only at gas stations with vapor
•
recovery systems that fully seal the mouth
of the filler neck during refueling
wearing neoprene gloves while handling a
•
fuel filler nozzle.
AKI (Anti Knock Index) is an average value of RON (Research Octane Number) and MON (Motor Octane Number) - (RON)+(MON)/2
15
Use of Additives
With the exception of gas line antifreeze dur-
ing winter months, do not add solvents, thick-
eners, or other store-bought additives to your
vehicle's fuel, cooling, or lubricating systems.
Overuse may damage your engine, and some
of these additives contain organically volatile
chemicals. Do not needlessly expose yourself
to these chemicals.
WARNING
Never carry a cell phone that is switched
on while refueling your vehicle. If the
phone rings, this may cause a spark that
could ignite gasoline fumes, resulting in fire
and injury.
WARNING
Carbon monoxide is a poisonous, colorless,
and odorless gas. It is present in all exhaust
gases. If you ever smell exhaust fumes
inside the vehicle, make sure the passenger
compartment is ventilated, and immedi-
ately return the vehicle to a trained and
qualified Volvo service technician for cor-
rection.
Demanding driving
In demanding driving conditions, such as
when towing a trailer or driving in hot weather
or for prolonged periods at high altitudes, it
STARTING AND DRIVING
may be a good idea to switch to a higher-
octane fuel (AKI 15 91 or higher) or to switch to
another brand of gasoline in order to fully uti-
lize the vehicle's engine capacity and optimize
traction.
Related information
Fuel (p. 415)
•
Emission controls (p. 418)
•
417