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:

Inspection
Test the horn by connecting battery voltage to the 1 terminal and ground the 2 terminal. The horn should make a sound. If the horn fails to make a sound, replace it. Horn Relay Inspection 1. ...

Air cleaner
Filter replacement It must be replaced when necessary, and should not be washed. You can clean the filter when inspecting the air cleaner element. Clean the filter by using compressed air. ...

Antenna. Repair procedures
Inspection Glass Antenna Test 1. Wrap aluminum foil (A) around the tip of the tester probe (B) as shown. 2. Touch one tester probe to the glass antenna termin ...

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