we did some testing with tractor hydraulic fluid a few weeks ago. Thought it would lubricate the pump better. which it did a good job at that, problem was it was too slick and ate up a brand new race series band in two runs. Went through trans, cleaned up everything and switched back to the original b&m trick shift and back to going rounds.
Guys out there run it but i'm stickin to my theory of why fix something that isn't broken. If it's working, why change.