i know exactly what it is happend to mine. the front structure is leaking. the bolts come loose at the top and the cam gear throws oil out at higher rpms. really common on the 5.9 and little 3.9. take everything off the front of the engine, rad, fan, belt and run the engine for a few seconds. rev it up a few times and you can see where it is leaking from

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you said its still under warranty?