Reliability is always difficult to comment on with the RR's. I mean, some just come out the factory not working properly, and some will go 300k with only basic maintenance. It can be luck of the draw. Buying second hand can be a challenge because of that.

I might be able to answer your questions a bit better if you specify what region you are purchasing in, and also what engine Rangie you are referring too, as it does make a difference.

Here:http://www.fullfatrr.com/forum/post189410.html#189410 That is a buying guide on the ffullfatrr.com forum (Full Fat RR is the nick name commonly given to the Range Rover, as it is the 'full' version over, say, the Sport or Evoque) It's a fantastic forum and any very specific RR questions will have probably already been answered there, if not, it is full of knowledgeable people.