The PQIA has a 2004 story refercned that may be of interest to those of us with farm tractors. It concerns the silly games that are played with THF, Trans Hydraulic Fluid for tractors with a sump common to the final drive and hydraulic sump. It was of interest to me because a few years back I sent a sample of the TSC "Traveller" house brand THF in for a VOA and found the additive pack rather lackluster. From that moment, I decided to go with an established brand CERTIFIED for my tractor unless I had good info on the particular product. This story is a few years old but still relevant, I think!
THF