I have a 90 420sel that for the last 2-3 days, it has been rather chilly in the morning and I have noticed for about 1-2 minutes that I have this whine when backing out of my drive, usually when turning the steering wheel. I quits, once I begin to roll forward pretty good down my street. I had a nissan once that had a slight power steering pump leak and when it got cold, if the fluid was not maxed out, it would whine until the motor warmed up a bit, sort of what I am experiencing now. Did your tranny fluid change help things? Did you whine continue on and on when you were driving. I have not had a chance to check my fluid level, but I will do that this evening when I get off work.