mjpeard

You can use any that meet the spec advised in the manual.Failure to do so will result in a message about DEF quality. If you have a service plan from the dealer DEF refills are free.

It’s on on the X260 models regardless of engine

They are not all fuse protected.....one of them is protected by a FET.

If it’s anything like the 2.2 the rear diff has a noise damper on it which was a service bulletin to remove if the customer experienced an issue at low revs. It’s one bolt a five minutes to remove. See below.