I'm using the Smith and Allan fluid and have had no problems at all. Definitely worth changing the fluid as the difference was that the box was much smoother after the change (probably never changed before for a long time). the fact that there is no dipstick means that you have to drop the fluid or undo a pipe to see what it looks like! It took me about an hour to drive up ramps, jack up the rear and put it on axle stands to level it, drain and refill (following the guide on the forum), then sit back on the ground. I also drained and refilled my engine with fresh oil (+ filter) at the same time.
Beinet's guide.
Make sure that you read it all, to the end of the thread.
