The oil feed pipe is situated behind the particulate fitter and wraps around the filter housing behind the heat shield, there are two banjo bolts one on either end and the torque is 22nm for the banjo bolts, you have to remove the heatshield and particulate filter to gain access, there three bolts in the top of the outer heat shield, two either side further down, then you need to remove the outer shield
Then undo both cat clamps and the two thirteen mm copper bolts either side near the bottom, the dpf will now slide out, and the back heatshield will come out aswell
The pipe starts about halfway up the block and twists and turns around the right side of the turbo... Don't lose the copper washers if you've not got new ones, there will be two at each end...
You should also remove the sump and make sure the oil pick up pipe isn't all gunked up and give the sump a clean out too aswell as change the oil and filter too