Kia Optima: Change to "winter weight" oil if necessary

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:

The Importance of the Passenger Being Properly Seated
The front seat passenger’s air bag is much larger than the steering wheel air bag and inflates with considerably more force. It can seriously hurt or kill a passenger who is not in the proper po ...

Identification Number Locations
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Inspection
1. Ignition "OFF" 2. Disconnect evaporator temperature sensor. 3. Using the multi-tester, Measure resistance between terminal "1" ...