Hi, I currently run a 2015 Sprinter 313 for my courier business and have owned several over the years but I am looking at a 2006 313 MWB 4x4 for a camper conversion. It has a slight whining noise from from drive and a little sticky in gear change - 168k miles - £4,500 ? has anybody any experience with 4x4 Sprinters or advice on what to look for ? Thanks in advance.