Greetings. I have a 2013 John Deere X500 lawn tractor with the Kawasaki Tuff Torq K72B transaxle and currently 271 hours. I have been using John Deere Low Viscosity Hygard trans oil per Deere specs. I have read a few posts here from people who substitute synthetic engine oil for Hygard, but I'm a little nervous about going that route. I do want to cut down on transaxle heat if I can do so without any negative effects on the unit. What are y'awl's thoughts on running Mobil 1 full synthetic ATF in place of Hygard? It would cost a little more, but I don't mind that. Any input you can offer would be appreciated. Thanks in advance.