These new fangled diesels seem to need their oil changing far too often due to fuel dilution and the new F150 seems to be top of the tables for this type of oil contamination problem.
Above 2% is high and more than 4% is serious, so I would see if the Ford dealer will check over the injection system.
Not sure how you took the sample, but you will get a higher figure if the engine is not run at normal temperatures for at least half an hour before a mid stream sample is taken.
Ford are talking rubbish when they say high fuel contamination is not a problem, as no one wants a truck that requires 3K mile OCI's to stay in limits, although oddly enough not all the new F 150 owners are suffering from this issue and it might be a case of a fuel injection system that is not designed to deal with idling too well, as that is when most of the contamination occurs. I am sure some of these new truck engines are not going to last as long as the old ones.
My own UOA's for a 10 year old V40 1.9 TD with 200K km total and 10K km oil changes has never show fuel contamination and my old Volvo is used like a taxi.
Overfilling the oil can cause big trouble with some engines, the old ones just spat it out the crank case vent, but since there is no outside vent on the new engines it either finishes up in the cylinders or blowing out the seals in a bad case.
Originally Posted By: Eddie
Wow 5-7%. My Mazda DI turbo engine shows 1 to 1.5% dilution and Blackstone Laboratories suggest that 2% should be ~ the Maximum. 5% sounds high to me, especially with your driving. Ed