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I HAVE AN 07 F250 LARIAT WITH 512,000 MILES. I DRIVE HOTSHOT. OVER TIME, I HAVE REPLACED MOST INJECTORS, HEAD GASKETS, NEW ARP STUDS(THIS SOLVED THE PUKING PROBLEM),NEW TURBO, HPOP, OIL COOLER, EGR COOLER, 2 FAN CLUTCHES, 2 WATER PUMPS,ETC. CHANGED MY OIL ABOUT 4 MONTHS AGO AND GOT "20 QTS" OUT OF THE PAN...TOOK IT IN TO MY MECHANIC...COULD BE A HEAD PROBLEM SO HAD THE HEADS REMOVED, PRESSURE TESTED, NEW INJECTOR SLEEVES, ARP STUDS, GASKETS, AND REPLACED 3 WEAK INJECTORS...PUT IT BACK TOGETHER..RAN LIKE A NEW ONE...PLENTY OF POWER, 19 MPG @2000RPM'S...4000 MILES LATER STARTED TO IDLE A LITTLE ROUGH..MECHANIC SAYS LEAKING INJECTOR...PUT IN 2 NEW FD INJECTORS ON DRIVERS SIDE....#2,#4,#6,#8 ALL NEW....4500 MILES LATER...STARTING TO IDLE A LITTLE ROUGH...TOMMORROW WE ARE REPLACING #3,#5 AND #7 INJECTORS(PROCESS OF ELIMINATION)...IF I STILL GET FUEL IN THE OIL AFTER ALL OF THIS....WHAT COULD IT BE? ANYBODY HAD THIS PROB.
 

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Usually it's an injector but with that many miles who knows.

By chance have you performed a manual compression test? If you pull your oil fill cap with the engine running does it puff a lot?
 

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check your fuel pressure with a master gauge. excess FP can cause fuel in oil.
 
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