Jaguar has just taken the wraps off its most advanced and powerful diesel model in its history, the all-new XF Diesel S. Powered by the carmaker’s new AJ-V6D Gen III S 3.0L six-cylinder turbodiesel engine, the sporty, yet efficient sedan will accelerate from 0-60mph in just 5.9 seconds and comfortably reach its electronically governed top speed of 155mph.

The 3.0L commonrail turbodiesel V6 engine is rated at 271hp (202kW) and 443lb-ft (600Nm) of torque – delivering 33% more power and 61% more torque from 1,500rpm than the XF’s existing 2.7L V6 diesel mill. Despite the performance gains, the bigger engine is also 12% more fuel efficient and has 10% fewer carbon-dioxide emissions. Jaguar claims it has a fuel economy of 34.5mpg (6.8L/100km) and an emissions rating of 179g of CO2/km.

A key feature of the new engine is the unique, parallel sequential turbocharger system, the first of its type to be fitted to a V-engine anywhere in the world. A six-speed automatic comes as standard.

There is also a 237hp (177kW) version of the 3.0L engine available, which produces 16% more power and a 15% increase in torque over the 2.7L diesel, allowing the XF to reach 60mph in 6.7 seconds and a top speed of 149mph. Fuel economy and emissions are similar to the more powerful unit.

Distinguished by discreet ‘S’ badging, the XF Diesel S also receives significant trim and specification changes. These include unique 20in alloy wheels and a discreet boot lid spoiler. A new Portfolio version will also join the lineup next year.