It is believed that work is already under way on the powertrain, which will be crucial to helping Aston meet tougher future emissions legislation. The most likely first recipient of the powertrain would be the soon-to-be-launched DBX crossover.
Aston Martin signed a technical partnership deal with Mercedes-AMG back in 2013. The deal allowed the British brand access to the AMG's 4.0-litre twin-turbocharged V8, which today can be found in the DB11 and Vantage coupes.
However, Autocar understands that the engine-sharing part of the deal was only ever meant to be temporary while Aston engineers work on a straight-six, which could be derived from Aston's current 5.2-litre V12.
Technical details of the engine are still firmly under wraps, but it looks likely to utilise hybrid technology developed through the brand's Rapide E programme. While a it might not be a full plug-in hybrid - Aston said last year the overall experience "isn't premium enough" for its customers yet - it should still combine the performance expected of an Aston with efficiency unheard of for the brand.
Aston will make use of the Mercedes-AMG deal for another few years yet, launching its hotly-anticipated DBX next year. That car will feature turbocharged V8 and V12 power initially, with a long talked about hybrid variant due early in the next decade.