I don't recommend any specific brand. If you want to use HD diesel engine oil, look for the API service description "CI-4". There is very little difference between brands other than advertising and marketing. If it's labeled CI-4 and is from a reputable manfacturer, it has passed the very rigid suite of tests to earn the CI-4 label.

The same applies to API SL oil for spark ignition engines.

Whether I am buying SL or CI-4 I just buy whatever major brand is "on sale" or has a lower regular price.

Whether a SL or CI-4 the only real difference is base stock - synthetic or mineral oil. The synthetics will always be more expensive, and you should use them if your model specifically requires them and go with the extended change intervals.

Since all my cars were originally designed for mineral based oil, that's what I use and I follow the manufacturers' recommended change interval.

Duke