I'm still on the fence if I should use the PermaTran in the front axle or if I should use a synthetic gear oil. My understanding is in cold country like Wisconsin . . That regular gear oil thickens more than permaTran but thevsynthetic gear oil maintains better cold temp pourability. Some present some pretty good reasons for the gear oil. While Massey manual says Permatran. I also waffled back and forth on using a synthetic hydro fluid like Kubota offers instead of Permatran . . . Again because of winter issues. Sometimes its not easy figuring out the difference between "acceptable" and "more beneficial" lol.