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Super Moderator
2015 High Country Duramax
19,348 Posts
Do not break in a diesel engine like a gas engine.

You need to work them. Don't be shy about loading it down and working it in. That's what they are made for.

Break in on new and rebuilt diesel engines i work on (heavy duty) consist of a few minutes of idle to make sure there is no leaks and to get it warmed up. Then hook up a loaded trailer and pull the hill on the highway.

As far as fuel, stick with high volume, name brand stations and you'll be good. A good additive never hurts either. Optilube xpd would be my recommendation, but there are many good ones out there.
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