Kia Optima: Change to "winter weight" oil if 
necessary - Winter driving - Driving your vehicle - Kia Optima TF 2011-2019 Owners ManualKia Optima: 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 you should use, consult an authorized Kia dealer.

Check battery and cables
Winter puts additional burdens on the battery system. Visually inspect the battery and cables as described in section 7. The level of charge in your battery can be checked by an authorized Kia ...

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. ...

See also:

Replacement
Head Lamp (Low) [General type] 1. Turn the head lamp switch off. 2. Disconnect the power connector from the lamp. 3. Remove the head lamp (Low ...

EPB Circuit Diagram (1)
...

Disc Brake Wear Indicators
Your vehicle has disc brakes. When your front brake pads are worn and it’s time for new pads, you will hear a high-pitched warning sound from your front brakes. You may hear this sound come and g ...

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