Jaguar Land Rover (JLR) will roll out all-new straight-six diesel and petrol engines next year and phase out all of its current ageing V6s.

Designed for all-wheel drive and rear-wheel drive applications, the new straight-six engines are part of the ‘Ingenium’ family of engines that already power -- in four-cylinder configuration -- the Discovery Sport and Jaguar XE.

Developed in-house at JLR, all engines will be direct-injection turbocharged 3.0-litres, says British mag Car, which broke the story, and will be offered in three states of power for both the petrol and diesel.

The petrol line-up will consist of 225/300/370kW outputs with the most powerful version of the 3.0-litre expected to come with twin turbos.

The diesel 3.0-litre, meanwhile, will be offered with 200kW in entry-level form, 250kW for the mid-spec diesel and a mighty 300kW for the range-topping straight-six that could replace the current 4.4-litre V8 in the Range Rover.

The advantage of the new Ingenium straight-six engines are their comparative light weight and low internal friction that’s said to bring significant gains in fuel consumption.

The new engine is also said to tap into Jaguar’s famous straight-six heritage.