My 790 is a couple of weeks old. While doing the maintenance listed in the owners manuel I noticed the hyd., and the front differential were low on the dipsticks. There are no leaks (i think just need topping off after everything has broken in) ; my question is should I get the original Deere fluids or go aftermarket? If I buy a 5 gallon bucket I ll probably have it setting there five years from now with 4.95 gallons left. I know i can use the front diff. fluid in my cutter. Thanks