Kia Optima: Change to "winter weight" oil if 
necessary - Winter driving - Driving your vehicle - Kia Optima TF 2011-2021 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:

Rear Shock Absorber Repair procedures
Replacement 1. Remove the rear wheel & tire. Tightening torque: 88.3 ~ 107.9N.m(9.0 ~ 11.0kgf.m, 65.1 ~ 79.6lb-ft)     Be careful not to damage the hub bolts wh ...

Seat Belt Pretensioner (BPT) Repair procedures
Removal 1. Disconnect the battery negative cable, and wait for at least three minutes before beginning work. 2. To remove the seat belt anchor pretensioner (C), keep on pushing the lock pi ...

Finish Maintenance Washing
To help protect your vehicle’s finish from rust and deterioration, wash it thoroughly at least once a month with lukewarm or cold water. Pay special attention to the removal of any accumulation of ...

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