Hyundai Elantra 2018 Automatic Diesel mileage: 250 KM Peace, mercy, and blessings of God be upon you. Elantra diesel has a roughness in the engine sound. Some say it's the timing chain, and some say it's the piston. I don't know. The body condition is not free from paint and bodywork, but the airbags and the front of the car are guaranteed. I just installed a new AC compressor and radiator, and the AC is freezing. The rest of the car's mechanics, like the gearbox and suspension, are guaranteed. I travel long and short distances with it.