From just a description (even a very good one like yours) it is hard to determine if it really is a problem. Of course, oil should not be coming out around an exhaust manifold - we all know that.
The way I see it, you've got a couple of options.
1 - Take it in and have someone look at it with the intention of fixing it.
2 - Take it in and have someone look at it with the intention of informing you as to the nature of the leak, and what exactly is causing it.
3 - Monitor the situation, and see if improves or gets worse over the next couple of thousand miles.
You've got warranty on your side. You're covered for 3/36 with no out-of-pocket. Therefore, the argument can be made to wait and see if it gets worse. (Or, the more pessimistic view - wait and see what else breaks.)
But, then again, you've got a $50,000 truck bleeding in your driveway...
The source of oil - if it is oil - could be rundown from assembly. These parts are lubricated prior to installation, and a protective film of oil is used after part manufacture but before assembly to prevent corrosion during storage and shipment.
I can see one valve seal going bad at low mileage from a supplier error. I can even see valve seals on one cylider head from a manufacturing error. But you've got 2 affected cylinders on different banks. Seems a little odd.
You might have a glow plug harness leak - but again odd to have it happen on two banks at low miles.
If it were mine, I'd keep an eye on it. But don't forget I'm a tech, and I don't have any money invested in the truck.
What do you think about having someone with experience take a look? Tell them you may not be prepared to have it fixed yet, if you wish....