2001 Freightliner with a 12.7 DDECIV pre egr. Showing fuel in oil for several years now on my HORIZON oil samples. level has been rising lately now up to 8% Had reman detroit injectors but put in a set of reman Bosch 100k miles ago. I had the old set pop tested and dye tested twice and they showed no leakage. Have not tested the new set.