Highway Driving
Tires
Adjust tire pressure to the specification. Low tire pressure will cause overheating and possible tire failure.
Avoid using worn or damaged tires, which may result in reduced traction or tire failure.
Never exceed the maximum tire pressure indicated on the tire.
WARNING - Underinflated/Overinflated Tires
Always check that tires are inflated correctly before driving. Underinflated or overinflated tires can cause poor handling, loss of vehicle control, and sudden tire failure, resulting in accidents, injury, or even death. For correct tire pressures, refer to "Tires and Wheels" in chapter 8.
WARNING - Tire Tread
Always check the tire tread before driving the vehicle. Worn tires can result in loss of vehicle control. Worn tires should be replaced as soon as possible. For more information and tread limitations, refer to Tires and Wheels in chapter 7.
Fuel, Engine Coolant, and Engine Oil
Driving at high speeds consumes more fuel than city driving. Be sure to check both the engine coolant and the engine oil.
Drive Belt
A loose or damaged drive belt may cause the engine to overheat.
Test yourself
A quick Kia Optima DL3 quiz: every answer comes with an explanation and a link to the manual page.