fuel in oil 04.5

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after 800 miles the oil is over filled by 1 gallon of fuel,325 hp ,64000miles
truck is use, for towing, the load is about 5000lbs. edge, intake, k/n, aurora
3000 turbo, banks exhaust, asi converter/large pan, 35in tires, still has the cat on it.
today complete dionostic, no leaks any where, they dyed and scoped motor and injectors, this was not a dealer. it was a cummins shop, the dealer told me the motor may not be broke in yet !!!!!!!!!! have other cummins the same
no problems!!!!!!!!!! help  

There is only a couple of ways fuel getting in oil, bad injector, o-rings or possible cracked head.  The injectors can have bad spray pattern and dumping fuel while running; also could be a cold leak.  Just because electrically injector may be ok doesn't mean no problem.  As for milage yes engine is getting broke in should not be a factor.  Any luck tracing problem down?