My E39 520 auto seems to be selecting a higher gear than necessary and I think this is causing it to stall at low speed and little accelerator. It works fine in M setting and does not have any problems. I have read on some sites that this needs a new gearbox, ouch!!!! but on others they say a dearbox oil change should sort the problem, which although costly is less ouch and more oh no!
Does anyone on here have any advice regarding what this is likely to be and the best way to sort this out?