We have 12k on our car now and its still running...not smooth or quiet, but still running.
Had to take it in at 1400 mi. for a rear diff howl and shifting probs. they replaced ring/pinion and bearings to fix the diff successfully.
The transmission however, not so much. second gear set was replaced and did not make much difference.
I specifically asked the service staff if there was an additive to help at that time.
I think I will go down and have them install the fluid at no charge.
The other thing I have noticed recently is that the shift lever moves forward and back on accel/decel in 1st and 3rd...does anyone know if this is a normal characteristic that I am just noticing (I don't do stop n go traffic very often) or is this another indication of a problem?