See also:

2006 Kia Optima
Far more buyers of reasonably priced economy-oriented cars are likely to notice the much-improved revamped 2006 Kia Optima midsize sedan. The new Optima has slicker styling, more power and added s ...

Engine cooling system
The high-pressure cooling system has a reservoir filled with year-round antifreeze coolant. The reservoir is filled at the factory. Check the antifreeze protection and coolant level at least once ...

Rear differential (4WD)
Checking or changing rear differential fluid Have rear differential fluid checked or changed by an Authorized Kia Dealer according to the Maintenance Schedule at the beginning of this section. ...