John Deere has recommendations for a longer period of "break in" oil than many manufacturers. I am fairly certain your dealer, your manual and/or the service bulletins on Deere.com are all going to clearly state re-fill with break in oil the first change time, up to 100 hours I believe. This has been posted many times here. To do otherwise is to make your own judgement against Deere's own guidelines, but, hey. It is your machine and your call. Does Deere have solid "evidence" of the efficaciousness of their procedure? Is the data out of date? Tough call. People typically point toward the large number of new autos coming with synthetic installed from day one, but it is questionable whether one can extrapolate that directly to a Deere engine.