Kia Optima: Change to "winter weight" oil if 
necessary - Winter driving - Driving your vehicle - Kia Optima TF 2011-2024 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:

Recommended SAE viscosity number
CAUTION Always be sure to clean the area around any filler plug, drain plug, or dipstick before checking or draining any lubricant. This is especially important in dusty or sandy areas and ...

Replacement
1. Disconnect the negative (-) battery terminal. 2. Loosen the mounting bolts and then remove the under cover (A). 3. Disconnect the connector ...

Recommended Shifting
Drive the vehicle in the highest gear that allows the engine to run and accelerate smoothly without hesitating or stalling. This will give you the most efficient fuel economy and emission control. ...

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