What is it?
It’s surprising how a better engine can improve the whole of a car’s character.
The diesel-engined Vauxhall Astra Sports Tourer has always seemed like an inoffensive, workaday sort of machine when powered by the long-serving 1.7 and 2.0-litre diesels, but it was nothing out of the ordinary.
However, the arrival of a new aluminium-blocked 1.6-litre unit – which matches the power and torque of some 2.0-litre versions, complies with Euro 6 emissions and slashes fuel consumption by 10 per cent – has given the car a new level of responsiveness and refinement.
The engine in our test car, whose punchy 134bhp at 4000rpm is accompanied by a healthy 236lb ft at 2000rpm, is part of a downsizing move that will run across the whole of Vauxhall’s four-cylinder petrol and diesel engine range.
The Hungarian-made 1.6 CDTi is the latest piece in Vauxhall’s plan to create three all-new engine families and reveal 23 new models by 2016.