I recently had the occasion to to VOA on the Traveller brand "Premium" Trans Hydraulic Fluid available at Tractor Supply. We have previously discusses this oil on this forum. I was very disappointed in the results and not a little chagrined because I had publicly advocated it as a generic replacement for the HyTran my Farmall 826 calls for. So, I got some virgin HyTran Ultra (advertised as a low zinc formula) and subjected it to a VOA. Then I got hold of a basic additive package blender use to make THF and added it to the Traveller. You can see the VOAs here: THF VOA Comparison I was not overly impressed with the HyTran either, as least based on the few other THF VOAs I've seen. What's missing is he zinc and I wonder what is used to replace it. THe new stuff is super strong and should do well. Whaddaya think.