I now have 100 hours on my 4066R tractor which I Purchased new. I did change the oil at around 80 hours and used John Deere Plus 50 10-30 oil as per the recommendation of the dealer that sold me the tractor. However I am a firm believer in synthetic oil’s and use them in all of my vehicles. My main reason for belief in synthetic oil‘s has to do with the wide temperature extremes which we experience up here in the Midwest. Having to use this tractor in -20° temperatures as well as 90+ degree temperatures.
I’m wondering if others have thoughts or are using synthetic oil in these YanMar engines on the John Deere utility tractors? What type and weight is best? I assume John Deere has their branded synthetic oil?