What is it?
The Volvo S60 D4 is the most frugal yet, and the first Volvo to record emissions below 100g/km. The new D4 is the first S60 to use Volvo’s new family of engines, a clean-sheet design built and designed by Volvo.
In time, Volvo will replace its entire engine line-up with two engines – one petrol and one diesel – with four diesel power outputs ranging from 120 to 230bhp. The 178bhp model tested here will become the third in that range, so despite those 99g/km emissions, it gives a tantalising taste of things to come – not least because the design enables straightforward electrification.
The engine uses the latest fuel-injector technology from Denso, which allows fuel to be injected at 2500 bar rail pressure, some 500-700 bar more than most competitors. Each injector features a sensor, rather than a single sensor shared across all four, and permits more precise injector control. Volvo says it can inject up to nine times per combustion cycle.
Other technologies see a reduction in internal friction, improved thermal management and exhaust gas after treatment.