It's past time to change my transmission fluid in the DK40 for the first time and I was thinking about going with the JD fluid (we have a 55 gallon drum) Since it takes almost 14 gallons, this would sure help me out. The manual gives choices of Shell Donax TD, Exxon Mobil hyd 560 or Mobilfluid 424. I don't know the specs on them but do know the JD is a premium trans fluid and is all my BIL will use in his tractors. The Kubota RTV I have is fickle and I only use UDT in it. Thanks, Bordercollie