Engine Hyundai-Kia G4KN

The 2.5-liter Hyundai G4KN SmartStream 2.5 GDI engine has been assembled by the concern since 2019 and is installed on the Kia K5 and on the Hyundai Sonata and Grandeur models. This engine is equipped with two rows of nozzles for direct and distributed fuel injection.

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

The engine was installed on:

  • Hyundai Grandeur 6 (IG) since 2019;
  • Hyundai Sonata 8 (DN8) since 2019;
  • Kia K5 3 (DL3) since 2019;
  • Kia Sportage 5 (NQ5) since 2021.


Production years since 2019
Displacement, cc 2497
Fuel system GDi + MPI
Power output, hp 194
Torque output, Nm 246
Cylinder block aluminum R4
Block head aluminum 16v
Cylinder bore, mm 88.5
Piston stroke, mm 101.5
Compression ratio 13.0
Features DOHC
Hydraulic lifters yes
Timing drive chain
Phase regulator on all shafts
Turbocharging no
Recommended engine oil 5W-30
Engine oil capacity, liter 6.0
Fuel type petrol
Euro standards EURO 5
Fuel consumption, L/100 km (for Kia K5 2020)
— city
— highway
— combined
Engine lifespan, km ~250 000

Disadvantages of the Hyundai G4KN engine

  • This motor began to be installed only recently and there are no statistics on its malfunctions yet;
  • The presence of a second row of nozzles should eliminate the problem of valve coking;
  • The catalyst is close to the block and its crumbs can get into the combustion chamber;
  • The resource of the electronic thermostat and adjustable oil pump is still unknown;
  • The engine is equipped with hydraulic compensators, which are picky about the quality of the lubricant.

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