Volvo 240 1991 Owner's Manual page 154

Volvo 1991 240 Model
During the winter, multigrade oil 10W-30 should be used in the engine.
The viscosity of the engine oil is important. Oil with low viscosity (thinner oil) improves cold-weather
starting as well as decreasing fuel consumption while the engine is warming up. To avoid difficult cold
start conditions (during extreme winter weather), use of 5W-30 oil, particularly the synthetic type, is
recommended.
Be sure to use good quality oil but do not use this cold-weather oil for hard driving or in warm weather.
See section "Engine oil" for more information.
Doors
Use Volvo Teflon lock spray or grease in the locks. They can be purchased from your Volvo dealer.
Note: Avoid the use of de-icing sprays as they can cause damage to the
locks.
Electrical system
The electrical system is subject to greater stresses during the winter. Lighting and starter motor are used
more often. The battery capacity is reduced at low air temperature. The state of charge must be checked
more frequently, and if necessary the battery should be recharged. The battery can freeze if the state of
charge is too low.
Windshield washers
Anti-freeze washer fluid should also be added to the washer fluid container for the windshield and rear
window (tailgate, wagon model) washer.
This is particularly important during the winter because the windshield frequently becomes dirty and is
often splashed with water which freezes rapidly. This may necessitate the frequent use of the windshield
washer and wipers. Your Volvo dealer can supply you with suitable anti-freeze for this purpose. Suitable
mixtures of anti-freeze and water are:
Down to +14 ° F (-10 ° C) 1 part anti-freeze 4 parts water.
Down to + 7 ° F (-14 ° C) 1 part anti-freeze 3 parts water.
Down to 0 ° F (-18 ° C) 1 part anti-freeze 2 parts water.
Down to -18 ° F (-28 ° C) 1 part anti-freeze 1 part water.
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