Nu 2.0 GDI (G4NC) vs Smartstream G3.5 (G6DU / G6DT)
Side-by-side reliability comparison
Specifications
Character
Nu 2.0 GDI (G4NC)
"Direct-injection 2.0 used mainly outside Western Europe (Tucson, Sportage, i40, Elantra, Soul). Its known fault is connecting-rod bearing wear: Hyundai and Kia recalled US cars, added knock-sensor monitoring software and a 15-year engine warranty there, and at least 45 Tucsons caught fire. European guides rate the i40 2.0 GDI as durable. Buy only with service history; a knock or the oil light means stop driving."
Smartstream G3.5 (G6DU / G6DT)
"Hyundai and Kia's naturally aspirated 3.5 V6 of the Smartstream generation (from 2020): port injection (G3.5 MPi, about 272 hp) or combined port and direct injection (G3.5 GDi, about 290-300 hp) in the Kia Carnival KA4, Sorento MQ4 and K8 and the Hyundai Santa Fe TM and Staria. Timing chain and hydraulic lifters. Too new for long-term data; engine guides expect about 300,000 km. US Carnivals were recalled for fuel leaks at the fuel rail. Not the Genesis 3.5 twin-turbo (G6DS) or the older 3.3 GDi (G6DH)."