Jaguar has upgraded the XF’s game by way of a new 3-litre diesel. The twin-turbo engine is offered in two options- 237bhp and 271bhp – providing stiff competition for the XF’s toughest oil-burning rivals, the BMW 530d and 535d. The XF Diesel S, in its higher model, sports 443lb ft of torque and a 5.9sec dash to 60mph, and tops out at 155mph. Average fuel consumption is 42mpg while CO2 emissions are 179g/km. Compared to the 2.7-litre diesel XF, power is up by a third with emissions and consumption down by around a tenth. Torque at 1500rpm is up by a massive 61 percent, so anyone upgrading will really reap the benefits of the new engine. Prices for this monster machine have not been released, but they will be higher than the current 2.7-litre diesel and will likely undercut the $52k and $60k commanded by the BMW 5-series diesels in M Sport trim.