BimmerZ5, I wanted to report back, concerning my transmission. I changed the oil and purge the system. And as a result I was hearing a sound similar to a Hydraulic pump cavitating. I did not read BimmerZ5 post clearly. I check the level with engine cold and hot but not running. The trick is the transmission must be warm level and engine running when toping off the trany. Its shifting smoother and happy:redspot