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:

Turbo Charger. Repair procedures
On-vehicle Inspection Turbocharger Diagnostic Flow If any problem related with turbocharger, such as lack of engine power, poor acceleration, abnormal engine noise or oil leaks, ma ...

Operation Principle
The CVVT has the mechanism rotating the rotor vane with hydraulic force generated by the engine oil supplied to the advance or retard chamber in accordance with the CVVT oil control valve contro ...

Inspection
Front Seat Heater Switch 1. Disconnect the negative (-) battery terminal. 2. Remove the floor console upper cover.(Refer to the BD group - "Console") ...