I just reached 10 hrs on my new X720. I went to the JD dealer to get oil and a oil filter to do the first oil change. I didnt have the manual with me so I wasnt sure what to get. I did remember seeing in the manual 10W something. However, the dealer gave me the John Deere "Plus 50" 15w-40 oil. I questioned him on it remembering that I saw 30W. He said this would be fine. However, when I got home, I noticed that the manual and sticker on the underside of the hood say to use 10w-30. Would there be any harm in using the 15w-40? Temps are around 80 degrees here now in upstate NY. Thanks.