Well...as a norm for me in these sorts of disagreements (referring to the T56 reduction g'box, to which I hasten to add, IS lubricated by the same oil as the engine! I had the unfortunate experience one time of having the g'box scavenge pump fail, and the subsequent pumping of the entire engine oil contents into the gearbox, which of course, forced me to shut it down!),
I make a point of asking the question of the opposer:
"How do you want your barley, before or after the horse?"
ew73