Cadillac has announced a new generation of V6 engines, led by a claimed exclusive twin turbo that it said would be one of the industry’s most advanced six cylinder petrol engines.

The engine will be offered in the new luxury sedan model line which makes its world premiere at the New York International Auto Show on 31 March. Production begins late in 2015 at General Motors’ Detroit-Hamtramck plant.

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Peak output is estimated at 400 horsepower (298kW) and 400lb ft of torque (543Nm) – 133 horsepower (99kW) per litre.

Cadillac said the engine is the only six to combine turbocharging with cylinder deactivation and stop/start to conserve fuel. It expects the combination to enhance fuel economy by up to an estimated 6%. Cylinder deactivation temporarily deactivates two of the cylinders in light-load driving conditions and reactivates them when needed.

The engine will come with the Hydra-Matic 8L90 eight-speed automatic transmission.

The turbochargers have lightweight, low inertia titanium aluminide turbine wheels and a patented low-volume charge air cooler which contribute to optimal boost production and more immediate power delivery.

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The turbochargers enable the engine to sustain peak torque from 2,500rpm to 5,000rpm, giving it a broad torque curve.

The new engine is part of a new generation of V6 powerplants which includes a new version of the 3.6-litre  naturally aspirated engine used for years across the brand’s model range. Each features new structural and combustion elements designed to complement higher performance and greater efficiency with “exceptional” quietness and smoothness.

Both new V6s will be produced at GM’s Romulus Powertrain Operations assembly facility, near Detroit, which received a US$540m investment to build the engines.