I highly doubt a fisher dealer is repackaging bulk ATF for use on electric pumps in Canada. More likely it is bulk aircraft hydraulic fluid, which is what plow fluid is. The performance of atf below 15 or so degrees F is noticeably worse, as it is much thicker. Your speed will be slower and your pump will draw more amps, so your headlights will dim more, etc. I converted a couple years ago and I was impressed with the difference right away. I'm still on my first gallon of fluid as well.
I used to use ATF for years, never had a problem. I now use the blue stuff. I like it better in the cold cold, also if you use ATF the red spot in the snow... is it from your trany or the plow?.... If its blue I know, If its red I know.
Life is tough... It's even tougher if your STUPID
24 years plowing only Driveways (about 100 of them)
00 Jeep Wrangler, 7 1/2 Boss V with my DP, Front Air Shocks, Duel Batteries, Lead rear bumper, ARBs, Belt Driven Air Compressor, Dana 60 Rear End, Blizzak Tires
00 Wrangler 7 1/2 Fisher RD, Air Shocks, Duel Batteries, Lead rear Bumper, Blizzak Tires
95 Wrangler 7 1/2 Fisher RD Air shocks, Lead in the trunk, Duel Batteries, Blizzak tires
Depending on the pump, and sometimes the temperatures, ATF is known to FROTH.... badly. Some pumps are fine with it, on others, it will blow out the seals.
What happens is that with the thicker fluids, when an air bubble gets mixed into the fluid, it won't bubble to the surface very fast, so rather than rising up, it will get sucked back down into the pump and churned in to the fluid, becoming froth. As you work it back and forth, up and down, a few times, more air bubbles work into the fluid and get frothed in by the pump. Then you end up with this mass of froth, which takes up more space than straight fluid, so your total froth volume exceeds the reservoir capacity and needs to push out somewhere. Its cold and thick though, so doesn't spill out the small vent, rather blows out the lift cylinder seal.
One of the places where air can get sucked into the system is from the pump inlet at the bottom of the reservoir. When the lift cylinder is fully extended and the fluid is low in the reservoir, that cold fluid may not spill down to the low spot very well, instead, a bit of air gets sucked in directly with the fluid.