Just got a 2010 D4 with the 3.0 TDV6, awesome car but yeah, a few things to watch.
Shane has it right with the front lower arms, and an OBD2 tool will be helpful.
Not that more things go wrong, just that you know about them whereas is other makes, may be a generic fault code or nothing at all.
Service records should be at LR dealers. If you have/get the V8, get shares in BP....