At launch, we were able to sample both the 2.0-litre petrol engine and the 2.2-litre diesel. The turbocharged petrol four-cylinder generates 149kW and 330Nm and will scoot from 0-100km/h in 7.2 seconds. The diesel engine is also turbocharged and makes 156kW and 450Nm and will get from 0-100km/h in 7.6 seconds, not far behind its snappy petrol sibling.
There’s some high tech wizardry beneath the skin, not the least of which is a carbon-fibre driveshaft across the Stelvio range. The engines are both matched to an eight-speed auto, and while you can paddle shift it manually if you prefer, we found it to be snappy enough in full auto mode.
First up, the diesel and its most obvious characteristic beyond the punchy torque delivery, is how quiet and refined it is. At highway speeds, there’s almost no engine noise whatsoever, and even when you ask it to work hard off the mark, there’s barely any note to identify it as an oiler. The mid range surge is strong, as we’d expect from a diesel, and it’s a beautifully flexible engine, matched perfectly to the gearbox.
Source : http://www.caradvice.com.au/584489/2018-alfa-romeo-stelvio-review/