I think in the"C" rated oil, the -4 rating is for 4 stroke applications. The current -4 rating is CI-4. Rotella 15W40 would be a good choice.API Oil Guide
I know there are certain break-in additives you want in your oil on gas cars, I'm not sure for diesels. There was a special lube I had to put on my new cam for break-in as well.Also, what all was done? What oiled parts are new?
Delvac 1 has this CI-4 rating.