Just heard from my mate with the 2 Duf XFs that the gearbox has gone again in the 530. This is just over 13 months since it was repaired by a ZF approved rebuilder. Some problem with the range change means gearbox out send away to said repairer to fit modified parts and another bill in excess of £3000. Apparently the 530 has an uprated box to handle the high torque output obviously not uprated enough in this case. 