Sprintman,
No argument from me on the 5W40 DelvacI. Good all around oil. However in my gas vehicle I prefer 10W30 and in a diesel I still like the 15W40. At $25 a gallon, I can't justify this type oil, and I do analysis on my diesels, not on my gas engines. I just change the oil and filter once a year using 10W30 Schaeffer's Series 7000. On my diesel's I use 15W40 Schaeffer's Series 7000 also. Both semi-syn.
Also, I wouldn't use any 5W40 that isn't dual rated at least CH/SJ, prefer CI/SL. So if Redline isn't dual rated for both I wouldn't put it in any diesel. JMO