Originally Posted by Munit
The only thing I can think of is that they build engines for bentley (or rolls? )one of the two with that same engine. However I read about taht and the engine in the bentley is stroked out by .6 litres so again its ecomony of scale is limited as that engine takes a bunch of specific tuning and research.
Bentley is owned by the VW group and not BMW. They now use VW derived engines, no longer BMW engines as they did in the past. Their V12 is two VR6s linked at the crank, sort of a W12.
Rolls Royce however is owned by the BMW group and uses BMW engines.