Kia Optima JF — Reliability

JF 2016–2020 1 engine

Reliability Summary

Engine G4NA — 72/100 ACCEPTABLE
Known Issues 3

Engine in this model

ACCEPTABLE 72

G4NA

Nu 2.0 MPI

The port-injected 2.0 non-turbo petrol of the Nu family, used in the Hyundai Tucson TL, Elantra, i40...

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Known Issues Across All Engines

Issue Engine Severity Onset
Piston and cylinder scuffing (engine rebuild) G4NA high —
Catalytic converter breaking up (debris enters the engine) G4NA moderate —
Oil consumption from sticking oil-control rings G4NA moderate 60,000 km – 80,000 km