Meyer M-I fliud shouldn't be used in a Western pump. Western suggests ( Western High Performance Hydralic Fuid). Some use ATF, but I'd stick with there only to be safe. If your looking to get rid of the Meyer fluid I'll buy it from you I was up in Richmond last week, bought 4 quarts of M-I and got ripped of at $6.58 quart:headwall :headwall
Happy New Year!!!
I've run a number of different products in my pumps through the years, I've owned Meyer, Western, Diamond and now Blizzard. Most commonly I've used ATF, but I've run 10W hydro oil and synthetic hydro oil too.
Each plow manufacturer recommends you use their high priced oil exclusively, I don't buy into it. I bought my first plow, the Meyer, used and ran it an additional 5 years, ran my Western 15 years, the Diamonds for 7 each with no pump failures at all. I think the most important thing is to keep your oil level up to avoid a dry pump, this is what will cook them.