Hi Snowsled7 and welcome to Bimmerfest !
All that I've written about (people having slippage problems after a regular oil change and fixing those problems after changing to a thicker oil) has been seen and done on these forums. That's where I learned about it.
You're obviously right about the problems that old transmissions have, and what I suggested earlier is not applicable in the OP's instance as he clarified later, but what I've written about has been experienced and solved on these forums by more than one individual.
Its so counter intuitive that I really could not have invented that. I get my info from here.
And there is a thicker kind of tranny oil, that someone tried after changing his old oil and then getting slippage issues, and then fixing the problem..... I lost the link to the actual post. I believe it was a royal purple or valvoline high mileage transmission oil product. It was some dude in Germany crowed about buying E34s for free from returning soldiers or something..
If I find the link to that thread, I'll post it up here again.
Last edited by robertobaggio20; 10-06-2012 at 11:04 AM.