Any good brand will do as long as it meets API classification CH-4, CI-4, or CJ-4. This will be on the container label in the API “Doughnut”. Most people, I believe, use Shell Rotella 15w-40 and Chevron Delo400 15w-40 because they are rated for four stroke diesel service, and are good for year ’round use. But beginning in December of ’16 the designations are going to morph again to “CK”.
http://www.api.org/products-and-services/engine-oil/eolcs-categories-and-documents/latest-oil-categories