Yep.
What verified my theory of separation was when I changed the tranny oil in my '71 Cougar several years ago. This car takes type "F" transmission oil, which possibly sits on the shelf for awhile because of it being a slow mover. This car allows you to drain the torque converter and I believe I had put in about 3-4 quarts of WM type "F" and then opened up a new case of Pennzoil type "F". The WM oil was in a dark blue bottle and was hard to see through. The Pennzoil was in the yellow bottle and you could see the bottom of the empty bottle if you held it up to the light. I noticed the Pennzoil had a bunch of deposits at the bottom of the bottle. After shining a light in the bottom of the empty WM bottles, they also had deposits. I put some oil in each bottle and shook each one up to get all the deposits out and make sure that all of it made it into the transmission.
After that episode, I always shake any and all engine oil jugs also. It makes me wonder how many deposits drop to the bottom of 55 gallon drums that sit in the warehouse for an extended time.