U 1.1 CRDi (D3FA) vs Smartstream G3.5 (G6DU / G6DT)
Side-by-side reliability comparison
Specifications
Character
U 1.1 CRDi (D3FA)
"Three-cylinder 1.1 CRDi diesel (2005-2019) from the Hyundai/Kia U family, used in the Kia Picanto, Hyundai i10 and i20 and Kia Rio. 75 hp, Bosch common rail, very low fuel use. No widespread serious fault is documented; the main costs come from soot clogging the EGR valve and intake swirl flaps in town driving, and early engines can push oil into the intake through the crankcase breather. Owners report 290,000 km and more. Evidence is limited, so the score is capped."
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)."