See also:

Transfer case (4WD)
Checking or changing transfer case fluid Have transfer case fluid checked or changed by an Authorized Kia Dealer according to the Maintenance Schedule at the beginning of this section. Use only ...

Your vehicle at a glance
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Impressive Warranty
Hyundai is Kia's corporate parent, so the Optima gets Hyundai's impressive warranty; it includes 10-year/100,000-mile powertrain protection and 5-year/60,000-mile roadside assistance. Kia is put ...