While I'll not bash any product marketed for a purpose as believe you get what you pay for, (most times) I will relay what I've physically seen with the "Traveler's" branded oil from TSC in my own tractor.
My HD-11 series B tractor was operated with the "Traveler's" branded "Universal" transmission oil for many years without problems. The prior owner used it citing cost and a slight leak in the speed control valve. At conclusion of the prior owner's project, the tractor was put up in a storage building and remained dormant in excess of 15 years.
The following is wordy in length but I want to put you there:
I made purchase of the tractor last year. With fresh batteries, along with topping of fluids and general checkover, it started right up running well. After allowing a good warm up, it was moved several hundred feet to a new staging area without problems proving all functions along the way. Nothing irregular was noted in operation. A month or so later I was going to start the tractor and upon checking the fluids noticed nothing on the transmission dipstick. Knowing the fluid that had been ran in the transmission and having a unopened 2.5 gallon jug of the same, this was installed but the sump was still low. I drove to TSC and purchased another five gallon pail of the same product and it took all of this pail to indicate on the stick, but was still low? Looking under the tractor I could see an oil slick which had soaked into the driveway so knew there was a leak. The tractor was started easily and if the engine RPM was elevated even slightly, it would spew transmission oil out of the engine starter mounting area. This is a power shift tractor and uses a torque converter with a wet housing. Transmission oil in the converter housing is normal and it uses a venturi pump to purge this oil and return it to transmission sump when the engine is running. The problem I've explained up to this point is something was siphoning the transmission oil into the torque converter housing when the engine was not running, and draining the transmission.
What i discovered after removing the floor pans and looking things over is an anti siphon valve is incorporated into this oil circuit. It is actually calibrated at .75"wc which is enough to seal any siphon effect for the elevation, but any pump suction readily allows flow through it. This valve was not sealing and the torque converter housing level was siphoning the transmission oil till this housing was overfull, then dumping it on the ground. Instead of a small amount of oil being retained in the torque converter housing, there as about two and a half gallons. When the engine was started, the spinning torque converter, and reduction geartrain was expelling the oil from the starter mounting area for about three minutes till the venturi pump evacuated the housing. Once this scenario was ascertained, and the torque converter housing emptied, transmission oil level with the engine running was much closer to where indications are normal.
Now with all that said, I disassembled the anti siphon valve and sure enough it was the culprit. I cleaned it in solvent and upon reinstallation, it works as it should with the siphoning effect being past tense. Running the tractor around on our property the transmission engagement, disengagement, and up, and down shifting are improving from my initial operation. I never thought there were any problems but there is a definite difference in the way the tractor operates with usage from my acquisition.
My findings are that the additive package used in this oil breaks down or becomes "sticky" with age, or dormancy. The adhesive sludge buildup in that anti siphon valve, and the lack of immediate power shift clutch pack disengagement is proof to me of this. As the tractor is operated this factor is reduced so I believe the oil additives are reblended into the parent by pumping action, heating, or a combination of the two.
I'm not vehemently opposed to this oil but it's not one I'll go out of the way to purchase. Typically I use either Chevron, or Mobil products but have a good friend that is the local distributor so cost is favorable.