Kia Optima: Change to "winter weight" oil if 
necessary - Winter driving - Driving your vehicle - Kia Optima TF 2011-2025 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:

Canister Close Valve (CCV). Specifications
Specification Item Specification Coil Resistance (Ω) 19.8 ~ 21.8 [20°C(68°F)] ...

Installation
1. Remove the ignition key from the vehicle. 2. Disconnect the battery negative cable from battery and wait for at least three minutes before beginning work. ...

EPB connector input/output
Pin No. Function Pin No. Function 1 - 21 Gear switch 2 - 22 ...

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