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Kia K5 DL3 (5th Generation, post-Optima rename)

2021–2026 · DL3 · sedan

Kia renamed the US Optima to K5 starting with the 2021 model year, aligning with the Korean-market name and the Stinger-inspired styling language. US lineup: 1.6L Gamma turbo (180 hp) standard, 2.5L Smartstream GDI (191 hp) on the LXS, and 2.5L Smartstream turbo (290 hp) on the GT (FWD only). First-ever AWD option on a Kia midsize sedan on LXS and EX trims. Built in West Point, Georgia.

Watch out: Smartstream is the post-Theta family of engines and has not been hit by the catastrophic recall pattern. The K5 GT's 290 hp routed through the front wheels has documented torque-steer complaints. The 2024 mid-cycle update softened some of the more aggressive styling cues.

What your K5 takes

The parts and fluids that fit this generation. Specs we publish are confirmed against two independent sources; the rest fill in as we verify them.

  • Tire size205/65R16✓ VerifiedView
  • Wiper blades26" driver · 16" passenger✓ VerifiedView
  • Engine oil0W-20 (5.1 qt) · 0W-30 (6.1 qt)✓ VerifiedView
  • BatteryGroup 48 · 760 CCA minFrom owner's manualShop
  • CoolantHyundai/Kia Long Life Coolant (phosphate-based ethylene-glycol)From owner's manualShop
  • Oil filterNot catalogued yetFind yours
  • Engine air filterNot catalogued yetFind yours
  • Cabin air filterNot catalogued yetFind yours
  • Spark plugsNot catalogued yetFind yours soon
  • Headlight bulbsNot catalogued yetFind yours soon
  • Brake fluidNot catalogued yetFind yours soon
  • Transmission fluidNot catalogued yetFind yours soon
  • Tire pressureNot catalogued yetFind yours soon
  • Key fob batteryNot catalogued yetFind yours soon
  • Power steering fluidNot catalogued yetFind yours soon
  • Differential fluidNot catalogued yetFind yours soon
  • Serpentine beltNot catalogued yetFind yours soon
  • Brake padsNot catalogued yetFind yours soon
  • Wheel fitmentNot catalogued yetFind yours soon
  • Brake rotorsNot catalogued yetFind yours soon
  • ThermostatNot catalogued yetFind yours soon
  • A/C refrigerantNot catalogued yetFind yours soon
  • Fuel filterNot catalogued yetFind yours soon

Floor mats

Our top custom-fit pick for the Kia K5 is the WeatherTech Custom Fit FloorLiners 1st & 2nd rows.

Floor mats for the Kia K5 →

Full clubhouse — owner Garage Lineage, common problems, year-by-year notes, and product picks — is on the build list.

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