Just from the top of my head, the Jaguar XJ was available with an I6 and a V12 for a differential of 6 cylinders.

Next car that came to mind is the A6/S6 available with anything from an I4 to a V10, correct?

Which car is/was available with the largest differential in cylinders?

Any other examples, can anyone think of a car that, from the factory, was available with a differential of 6 cylinders or more?