Transmission problems

[donmi]

Hi guys,

our 4.4 has some transmission issues. It started a few months ago, when we had to stop on a light hill and got going again, there was a bang to hear when my wife started to drive again and you could "feel" the bang.

After that no issues for a while and now since a few days, it shifts rough from the first to the second gear and again you can "feel" it. The X5 has now 175.000km and I am wondering if I please get some advice from you guys.

Otherwise it works fine and no slipping.

Would an oil change help (even if BMW state it's for life) ???

Thanks!