In Reply to: Hydraulic Fluid Sources and Type posted by Kimberly on March 10, 2019 at 23:49:42:
The originally-specified 80 or 90 weight gear oil is probably a better transmission and final-drive lubricant – the downside is that it is not so good as a hydraulic fluid, especially in cold weather. For those reasons, a combination transmission/hydraulic fluid which does conform to the Ford M2C134D spec is probably a better compromise between hydraulic system performance and gear lubrication. I live in a cold climate so I use theExteme in the link I'm posting. I worked great for years in my 8N. I've since sold it and purchased a Ford 3000. That's what I'm using in it also. If I lived where it was warm I would just use the 80-90 gear oil.