I saw that recently when buying fluids for my 8.25.
One thing that stopped me from considering it was that even though it was a Castrol product (which I generally trust) I wanted to go with a Valvoline conventional and the Ford LSD additive as recommended by Dr. Diff.
I also read in multiple places on the net (so you know it's true:D) that it's not a good idea to use higher viscosity fluid like 75-140 in LSD's.
The opinion overall was that the higher vis fluids can't get into the clutches and thrust surfaces with as much volume as the thinner fluids and can end up causing galling.
For some reason I can't quite actually put my finger on why I like Castrol synthetic engine oils and Valvoline or Lucas gear oils.
Maybe it's the taste.:D
