Kia Optima: Change to "winter weight" oil if 
necessary - Winter driving - Driving your vehicle - Kia Optima TF 2011-2026 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:

Digital Clock
When the ignition switch is in the ACC or ON position, the clock buttons operate as follows: A digital clock will not be installed if your vehicle comes equipped with an audio system. Vehicles ...

Warning / Caution Label Locations
1. Radiator cap caution 2. Fan caution 3. Battery caution ...

Repair procedures
Inspection [System Inspection] 1. Disconnect the vapor hose from the throttle body and connect a vacuum pump to the nipple on the throttle body. 2. Chec ...

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