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Changing brand of hydrolic fluid

Discussion in 'Truck & Equipment Repair' started by EddieChow, Dec 30, 2009.

  1. EddieChow

    EddieChow Junior Member
    Messages: 4

    I want to change the fluid in my Fisher MM1 from the generic type to the Fisher blue fluid. (the generic is VERY thick, and I assume it is contributing to the sluggish operation of the plow's hydraulics compared to my 2 other Fishers) The brand is AGS Snow Plow Quick Lift.
    My concern is the warning about mixing different types of fluid . . . Am I okay as long as I get as much of the old out as is possible when doing the seasonal fluid change (disconnect lower hoses and retract both angle rams etc.) or do I need to try and flush out the old a little bit more?