I recently switched to Lucas full synthetic fluid and could not be happier with its low temp performance (so far). Very reasonable price too.
www.tractorbynet.com

Low temperature hydraulic fluid?
I live in MN and we get some very cold winters (obviously). Last winter was the first cold season I had my tractor and I had a heck of a time getting the hydraulic fluid warm enough to even move the tractor on multiple occasions. I ended up installing several electric oil pan heaters where I...
