What's the best engine in the Rover 75?

I am looking for a Rover 75 and can't seem to find out which were built by BMW and which engine is a BMW engine. There is a 1.8 petrol, 2.0lt diesel and a 2.5 V6 petrol, don't really want a diesel so it's...

Does the Jaguar XF have a Ford engine?

Is the Jaguar XF R-Sport (2016) a Ford or Jaguar engine?

Is carbon cleaning any good?

Is a carbon clean good for your engine?

What are the best versions of the Peugeot 1.2 PureTech engine?

I understand the 1.2 PureTech Citroen engine is well regarded but have read reports of problems with the cam belt running in oil being unreliable. I gather it has been updated over its life and now is...