Kia 2016 Optima Owner's Manual page 568

Lubricant
Coolant
Brake fluid
Fuel
Specifications, Consumer information, Reporting safety defects
Volume
7.50 US qt. (7.1 l )
1.6 T-GDI
2.0 T-GDI 7.92 US qt. (7.5 l )
2.4 GDI 7.60 US qt. (7.2 l )
0.47 US qt.(0.45 l )
18.5 US gal. (70 l )
Classification
Mixture of antifreeze and water
(Ethylene-glycol with phosphate based coolant for
cooling device)
FMVSS116 DOT-3 or DOT-4
Unleaded gasoline
9 7