Initial oil change (50 hrs) is coming up on my 2016 Kubota MX 5200. It is 52 hp, turbo with diesel particulate filter. The transmission is hydrostatic and the tractor is equipped with 4x4 and a front end loader. I tend to run at the 2000 rpm range for everyday tasks and 2500 rpm when working it such as bush hogging. I have looked at the Delo, Delvac and Rotella 15W-40 virgin oil analysis and need some help. I am torn as to which oil to use. Could someone suggest which oil would be best based upon the VOA and why it stands out above the rest?