Volvo S90 TWIN ENGINE 2019 Owner's Manual page 460

STARTING AND DRIVING
Winter driving
It is important to check the vehicle before driving
in cold/snowy conditions to make sure it can be
driven safely.
Before the cold season arrives:
Make sure the engine coolant contains 50%
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antifreeze. This mixture helps protect the
engine from frost erosion down to
approx. -35 °C (-31 °F). Do not mix different
types of antifreeze as this could pose a
health risk.
Keep the fuel tank well filled to prevent con-
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densation from forming.
Check the viscosity of the engine oil. Oil with
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low viscosity (thinner oil) improves cold-
weather starting and reduces fuel consump-
tion when driving with a cold engine.
CAUTION
Low-viscosity oil should not be used with hard
driving or in hot weather.
Check the condition and charge level of the
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start battery. Cold weather places greater
demands on the start battery and reduces its
capacity.
Use washer fluid containing antifreeze to
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help prevent ice from forming in the washer
fluid reservoir.
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Slippery driving conditions
For optimal traction and roadholding, Volvo rec-
ommends using snow tires on all wheels when-
ever there is a risk of snow or ice on the road.
NOTE
Certain countries require use of winter tires
by law. Not all countries permit the use of
studded tires.
Practice driving on slippery surfaces under con-
trolled conditions to learn how the vehicle reacts.
Related information
Snow tires (p. 563)
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Snow chains (p. 563)
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Braking on salted roads (p. 433)
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Braking on wet roads (p. 433)
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Filling washer fluid (p. 635)
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Start battery (p. 601)
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Replacing windshield wiper blades (p. 633)
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Refilling coolant (p. 599)
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Driving through standing water
Driving the vehicle through a deep pool of stand-
ing water on a water-covered roadway is called
fording. This must be done with great caution.
To prevent damage to the vehicle when driving
through water (e.g. on flooded roads):
Do not drive in water higher than the floor of
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the vehicle. If possible, check the depth of
the water at its deepest point before driving
through it. Be particularly careful when driv-
ing through flowing water.
Do not drive faster than walking speed.
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Do not stop the vehicle in the water. Drive
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carefully forward or back the vehicle out of
the water.
Remember that waves created by passing
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vehicles could cause the water level to rise
above the vehicle's floor level.
Avoid driving through salt water to help avoid
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the risk of corrosion.