If it was my lift i would drain and flush the entire Hydraulic system and change the filter(s). Dont know what the temperature range is there in Alabama but the oil viscosity should match your temperature range,you should consult with a local fluids dealer to see what they recommend.
You might be able to get away with just draining and refilling but do you really want to take that chance. The Diesel fuel could play havoc on cylinder/Hyd. valve seals or worse yet the pump seals and pump itself.
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