Kia Optima: Check spark plugs and ignition 
system - Winter driving - Driving your vehicle - Kia Optima TF 2011-2019 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:

Lumbar support (for driver’s seat)
Press the front portion of the switch to increase support, or the rear portion of the switch to decrease support. ...

Intake Air Temperature Sensor (IATS). Schematic Diagrams
Circuit Diagram ...

Panoramaroof Switch. Repair procedures
Inspection 1. Disconnect the negative (-) battery terminal. 2. Remove the overhead console lamp assembly.(Refer to the BD group - "Roof trim") ...

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