I have a John Deere 6310 tractor that lost about 7 gallons of hydraulic fluid. The manual calls for John Deere HY-GARD. I can drive 45 miles and pay $64.21 for each 5 gallon bucket of fluid at the John Deere dealership or I can drive 8 miles and pay $42.89 at my local NAPA dealer. The John Deere...