Kia Optima Transmission and Engine Oil Specifications

Kia Optima Fluid Capacities: A Comprehensive Guide for 2015-2024 Models

The Kia Optima, also known as the K5 in some markets, has undergone significant changes over the years, particularly in its powertrain options. This guide focuses on the fluid capacities and specifications for the latest two generations of the Kia Optima, covering models from 2015 to 2024. We’ll explore the various engine and transmission combinations, their respective fluid capacities, and recommended maintenance schedules. Whether you’re a Kia Optima owner, a mechanic, or simply an automotive enthusiast, this comprehensive overview will provide valuable insights into the fluid requirements of these popular midsize sedans. From engine oil to transmission fluid, coolant to brake fluid, we’ve compiled all the essential information to keep your Kia Optima running smoothly and efficiently.

Fourth Generation Kia Optima (2015-2020)

The fourth-generation Kia Optima, also known as the JF model, was produced from 2015 to 2020. This generation offered a range of engine and transmission options, catering to various markets and consumer preferences.

Engine Options

Engine ModelDisplacementPower OutputEngine Oil CapacityEngine Oil Specification
G4KJ (Theta II)2.4L185 hp4.8L (5.07 US qt)5W-30, API SN PLUS, ILSAC GF-5
G4KH (Theta II Turbo)2.0L Turbo245 hp4.8L (5.07 US qt)5W-30, API SN PLUS, ILSAC GF-5
G4FJ (Gamma II)1.6L Turbo178 hp3.8L (4.02 US qt)5W-30, API SN PLUS, ILSAC GF-5
D4FD (U2)1.7L Diesel141 hp4.5L (4.76 US qt)5W-30, ACEA C3

Transmission Options

Transmission ModelTypeATF CapacityATF Specification
A6MF16-speed automatic7.1L (7.5 US qt)SP-IV
A6LF26-speed automatic7.8L (8.24 US qt)SP-IV
7DCT7-speed dual-clutch1.9L (2.01 US qt)7DCT
M6CF16-speed manual1.8L (1.9 US qt)API GL-4, SAE 75W/85

Fifth Generation Kia K5/Optima (2020-2024)

The fifth-generation Kia Optima, renamed K5 in many markets, was introduced in 2020 and is still in production as of 2024. This generation brought significant updates to the powertrain options.

Engine Options

Engine ModelDisplacementPower OutputEngine Oil CapacityEngine Oil Specification
G4NJ (Smartstream)2.5L191 hp5.8L (6.13 US qt)0W-30, API SN PLUS, ILSAC GF-6
G4KP (Smartstream)2.5L Turbo290 hp5.8L (6.13 US qt)0W-30, API SN PLUS, ILSAC GF-6
G4FL (Smartstream)1.6L Turbo180 hp4.8L (5.07 US qt)0W-30, API SN PLUS, ILSAC GF-6

Transmission Options

Transmission ModelTypeATF CapacityATF Specification
A8LF18-speed automatic9.2L (9.72 US qt)SP-IV-RR
8DCT8-speed dual-clutch2.2L (2.32 US qt)SP-IV-RR

Other Fluid Capacities

Fluid TypeCapacitySpecification
Coolant7.5L (7.93 US qt)Phosphate-based coolant
Brake Fluid0.7-0.8L (0.74-0.85 US qt)DOT-4
Power Steering Fluid1.0L (1.06 US qt)PSF-4
Washer Fluid4.5L (4.76 US qt)

Maintenance Schedule

To ensure optimal performance and longevity of your Kia Optima/K5, follow this general maintenance schedule:

  • Engine Oil and Filter: Change every 7,500 miles (12,000 km) or 12 months, whichever comes first
  • Automatic Transmission Fluid: Inspect every 30,000 miles (48,000 km), replace if necessary
  • Manual Transmission Fluid: Inspect every 40,000 miles (64,000 km), replace if necessary
  • Coolant: First replacement at 120,000 miles (192,000 km) or 10 years, then every 30,000 miles (48,000 km) or 2 years
  • Brake Fluid: Replace every 2 years
  • Air Filter: Replace every 30,000 miles (48,000 km)
  • Spark Plugs: Replace every 100,000 miles (160,000 km)

Always consult your vehicle’s owner’s manual for specific maintenance intervals, as they may vary depending on driving conditions and regional requirements.

Word from Sir Erwin

As an automotive enthusiast and expert, I cannot stress enough the importance of proper fluid maintenance in your Kia Optima or K5. Regular checks and timely replacements of engine oil, transmission fluid, coolant, and other vital fluids are crucial for the longevity and performance of your vehicle. Always use the recommended fluid specifications and adhere to the maintenance schedule provided by Kia. By doing so, you’ll ensure that your Optima continues to deliver the reliability and driving pleasure it’s known for, mile after mile.

Remember, while this guide provides general information, it’s always best to consult your vehicle’s specific manual or a certified Kia technician for the most accurate and up-to-date recommendations tailored to your particular model and year. Happy driving, and may your Kia Optima serve you well for years to come!

Citations

[1] Kia K5 – Wikipedia
[2] Kia Optima – Ultimate Specs
[3] Kia Optima – Auto Data
[4] Kia Optima IV 2.0 CVVL – Auto Data