Kia Optima: Check spark plugs and ignition 
system - Winter driving - Driving your vehicle - Kia Optima TF 2011-2020 Owners ManualKia Optima: Check spark plugs and ignition system

Inspect your spark plugs as described in section 7 and replace them if necessary. Also check all ignition wiring and components to be sure they are not cracked, worn or damaged in any way.

Change to "winter weight" oil if necessary
In some climates it is recommended that a lower viscosity "winter weight" oil be used during cold weather. See section 8 for recommendations. If you aren't sure what weight oil y ...

To keep locks from freezing
To keep the locks from freezing, squirt an approved de-icer fluid or glycerine into the key opening. If a lock is covered with ice, squirt it with an approved de-icing fluid to remove the ice. ...

See also:

Weight Classification System (WCS). Components and Components Location
Components ...

Inside rearview mirror
Adjust the rearview mirror so that the center view through the rear window is seen. Make this adjustment before you start driving. WARNING - Rear visibility Do not place objects in the rear seat ...

Seat warmer (if equipped)
The seat warmer is provided to warm the front seats during cold weather. While the engine is running, push either of the switches to warm the driver's seat or the front passenger's sea ...

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