Which local shop?
Fluid type should not be the problem. That would not cause such a quick and dramatic failure. Simply changing fluid should not hurt anything. But, a very improper fluid level, clogged filter, or some other major mechanical screw up might do this.
I assume trans fluid was changed from your post. I also assume the X5 is auto trans. On my previous Audis, (ZF transmissions like most BMWs) filling the trans fluid after a change was very complicated. It required a lift, running the car through the gears while filling, and an overnight stay at the shop to fill when cold. In the Audi's case, simply filling the trans fluid without all this stuff would fool you into thinking the fluid was full when it was not. Perhaps this is the case with your car.
Fluid type should not be the problem. That would not cause such a quick and dramatic failure. Simply changing fluid should not hurt anything. But, a very improper fluid level, clogged filter, or some other major mechanical screw up might do this.
I assume trans fluid was changed from your post. I also assume the X5 is auto trans. On my previous Audis, (ZF transmissions like most BMWs) filling the trans fluid after a change was very complicated. It required a lift, running the car through the gears while filling, and an overnight stay at the shop to fill when cold. In the Audi's case, simply filling the trans fluid without all this stuff would fool you into thinking the fluid was full when it was not. Perhaps this is the case with your car.