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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. ...

Dimensions
The typical sedan is tremendously heavier than the Kia Rio. Your wallet will hurt more every time you fill up the typical sedan than the Kia Rio because of its larger tank. The Rio and the typical ...

Efficient, Powerful Engine
Available in two powerplants - a 2.4-liter four-cylinder or a 2.7-liter V6 engine - and two five-speed transmissions (manual with LX four-cylinder model only), the 2009 Kia Optima introduces a new ...