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 guy said he would sure like to see me use the John Deere HY-GARD. The NAPA guy tells me that NAPA meets all requirements of the HY-GARD lubricant. I sure would like to save the money and time by purchasing the hydraulic oil at NAPA. Do you think that is safe to do? Thank you for your answer.