I had wrote a article here some time ago on fuel in my oil.I had a 50/50 mix in the pan,about 5 Gal. total.Drained it & changed filter,had only about 12 Gal. of fuel left in it so I went & got me some additive for the fuel & injectors.It treated 100 Gal. so I dumped the whole thing in the tank with the 12 gal. fuel & ran it as close to empty as I could.Did this 4-6 times & as of today not a drop of fuel in the oil.Got a little over 1200 miles on it now since I changed it & treated it.Got a feeling the injector tips were either carboned or there was dirt or carbon in the tips holding who knows how many open when ya shut it down.If carbon or dirt gets into the tip by the ball it'll hold it open & the fuel will keep running in to the cylinders untill the rail pressure drops to were it wont bleed anymore.So far so good.I check the oil everyday now,kinda gun shy after that senerio.Also do a papertowel test about every two weeks.Talk about gittin lucky,MAN.Cant prove what caused it or what cured it but is good to go now.