Volvo VNL 780 Operator's Manual page 353

For cold weather operation, follow these recommendations:
•
When starting the engine in temperatures below ?15 C (5 F), use engine lubricants
of lower viscosity. See the Operator's Manual Vehicle Maintenance for additional
information.
•
When the temperature is below freezing, make sure the concentration of antifreeze in
the coolant is sufficient to prevent freezing. Refer to the Operator's Manual Vehicle
Maintenance for additional information.
•
During cold weather, pay more attention to the condition of the batteries. Test them
frequently to ensure sufficient power for starting. A dead battery may freeze.
•
Fuel cloud point is the temperature at which wax crystals become visible, which is
generally above the pour point of the fuel. To keep the fuel filter elements from
plugging with wax crystals, the cloud point should be no higher than the lowest ambient
temperature at which the engine must start
To prevent wear and possible damage to the engine when it is cold, gradually bring it up to
operating temperature before operating at high engine speeds or full load. After starting and
before moving the vehicle, run the engine at 800 to 1000 rpm for 3 to 5 minutes. Operate at
partial engine load until the coolant temperature reaches 75 C (165 F).
OPERATION 343