The K5 is the Optima’s replacement. We found this competitively priced midsized sedan to be roomy, fuel efficient, and user friendly.
The standard 1.6-liter turbo four-cylinder engine punches above its weight class, and it delivers robust power that’s impressive from such a small displacement powerplant. It also delivers a commendable 32 mpg overall. The mostly smooth-shifting eight-speed automatic transmission is responsive but we noted a slight hesitation from a rolling stop—such as when a driver accelerates after slowing down for a red light that turns green before the car is stopped—which can be annoying.
The K5’s ride is steady and compliant and a notch better than its platform mate, the Hyundai Sonata. Note, however, that the GT-Line and the EX trims come standard with 18-inch wheels which detract from comfort, making the ride more tense. Ironically, the LXS may have a more comfortable ride, but it does not come standard with a power driver's seat and lumbar support adjustment.