Engine Hyundai-Kia G4KM

The Hyundai G4KM SmartStream 2.5 MPI 2.5-liter gasoline engine has been assembled since 2019 and is installed on the eighth generation Sonata and the fourth generation Kia Sorento crossover. The unit belongs to the new Theta III family and is equipped with multiport fuel injection.

Theta 2.5L family: G4KM, G4KN, G4KP, G4KR.

The engine was installed on:

  • Hyundai Sonata 8 (DN8) since 2019;
  • Kia Sorento 4 (MQ4) since 2020.


Production years since 2019
Displacement, cc 2497
Fuel system distributed injection
Power output, hp 180
Torque output, Nm 232
Cylinder block aluminum R4
Block head aluminum 16v
Cylinder bore, mm 88.5
Piston stroke, mm 101.5
Compression ratio 10.5
Features DOHC
Hydraulic lifters yes
Timing drive chain
Phase regulator at inlet and outlet
Turbocharging no
Recommended engine oil 5W-30
Engine oil capacity, liter 5.9
Fuel type petrol
Euro standards EURO 5
Fuel consumption, L/100 km (for Hyundai Sonata 2020)
— city
— highway
— combined
Engine lifespan, km ~250 000

Disadvantages of the Hyundai G4KM engine

  • This engine has just appeared and the statistics of its malfunctions have not yet been collected;
  • So far, on specialized forums, the most active complain about oil consumption from the first km;
  • The catalyst is located close to the block, its crumbs can get into the combustion chamber;
  • Let’s look at the resource of an adjustable oil pump, as well as an electronic thermostat;
  • This motor is equipped with hydraulic lifters, which are picky about the quality of the oil.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top