The viscosity is incorrect, as well: the manual calls for 10W-30, and the oil proposed for use, is 5W-30. The 10W is thicker, at cold temperatures, compared to 5W. While it sounds like a small difference, I can tell you that I did the same in a motorcycle: I used 5W-40, when the maker specified 10W-40. My clutch started having issues, as well as my transmission having issues shifting (engine oil is shared with the transmission on my motorcycle). I switched back to 10W-40 oil, and my clutch and transmission issues disappeared.
Granted, I am comparing a motorcycle engine/transmission to a diesel tractor engine, but the principle is the same: use the specified viscosity range of oil mandated by the maker -- their engineers specified a particular viscosity range for very good reasons! Modern internal combustion engines have very tight tolerances -- move outside of those tolerances and damage is extremely likely to occur! Cheers!