Kia Optima— Transmission Guide
Complete transmission type, fluid specification, and service interval data for every Kia Optima generation.
2016–2020
Optima — 2.4L NA (LX/EX trims)Transmission
6-Speed Automatic
Code: 6AT
Fluid Specification
ATF (check OEM spec — many require brand-specific)
Service Interval
Every 30,000 miles
Engine
Theta II 2.4L GDI (G4KJ) — 2.4L — Direct Injection
Drivetrain Options
FWD
2016–2020
Optima — 1.6T (LX Turbo trim)Transmission
7-Speed Dual-Clutch (DCT)
Code: 7DCT
Fluid Specification
Dual-clutch fluid (dry clutch — Kia/Hyundai DCT oil)
Service Interval
Every 40,000 miles
Engine
Gamma 1.6 T-GDI (G4FD) — 1.6L (Turbo) — Direct Injection
Drivetrain Options
FWD
2016–2020
Optima — 2.0T (SX / SXL trims)Transmission
6-Speed Automatic
Code: 6AT
Fluid Specification
ATF (check OEM spec — many require brand-specific)
Service Interval
Every 30,000 miles
Engine
Theta II 2.0 T-GDI (G4KH) — 2L (Turbo) — Direct Injection
Drivetrain Options
FWD
Frequently Asked Questions
What transmission does a Kia Optima have?
The Kia Optima uses a 6-Speed Automatic (6AT). Depending on the model year and trim level, the exact transmission may vary — see the year-by-year breakdown above for full details.
What fluid does a Kia Optima transmission take?
The recommended transmission fluid is ATF (check OEM spec — many require brand-specific). Always verify with your owner's manual or dealership, as the correct fluid can vary by production year and transmission variant.
How often should I service the Kia Optima transmission?
The recommended service interval is every 30,000 miles. Severe driving conditions (towing, frequent stop-and-go, extreme temperatures) may require more frequent service. Regular transmission maintenance is one of the best ways to prevent costly repairs.
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