Oil in Fuel 2003 6.0 help!!

[creep403]

I have a 2003 F350 6.0 with 187,000mi I had an injector replaced about 4weeks ago and ran good. bout a week ago another went out. yesterday she just died on the highway and would not start. Had her towed into the nearest town and mechanic said there was oil in the the deisel when he checked the top filter housing. Any help or clues is much needed. Thankyou all