Kia Soul EV 2018 Owner's Manual page 467

Specifications & Consumer information
RECOMMENDED LUBRICANTS AND CAPACITIES
To help achieve proper performance, durability, use only lubricants of the proper quality for your vehicle.
These lubricants and fluids are recommended for use in your vehicle.
Lubricant
Reduction gear oil
Coolant
Brake fluid
8 6
Volume
1.3±0.1 l
(1.4±0.1 US qt.)
5.1 l
(5.39 US qt.)
Classification
70W, API GL-4, TGO-9 (MS517-14)
Mixture of antifreeze and water
(Ethylene glycol base coolant for aluminum radiator)
FMVSS116 DOT-3 or DOT-4