Transmission and Differential Oils

When I had Randy do the rear subframe reinforcement, I supplied him with new BMW SAF-XJ in 1-liter bottles.  I had never seen these before and was excited to get them.  In reality when I picked up the car, I think the diff was loud.  So I have switched back to the Mercedes/Castrol 75W-140 SAF-XJ diff oil I buy from ECS.  You would think they work the same since they are both SAF-XJ, but they do not. 

Also, per the recommendation of a guy on Bimmerforums, I switched the transmission oil to standard Dexron III.  I used Motul, which is a higher end brand.  Previously I had been using BMW LT-2 but there is a theory that LT-2 causes the sticky shift pin issue.  Having replaced the shift pins on my S54, and knowing I don't want to do that job again, I am trying the Dexron III.  You cannot tell when you drive the car it is any different than LT-2.  Costs less too.