What is the 4x4 like on these is it constant or can you change to 2 wheel drive?

Ok so in all its not a motor just as long as you look after it and maintain it on a regular basis is there anything I should look for when buying one?

Ok is it true that BMW made the engin in some hence why some are cam chain!

Hi all I'm thinking of buying a freelander 2005 ish model diesel but I've heard a lot of bad things about them is this on all years or just certain years and models?