I have a 2011 6.7 Powerstroke. I have always sent my crankcase oil to LubeWatch for analysis.
At 188474 miles the analysis came back with 5.9% fuel dilution and 9.7 cST at 100C.
at 194667 miles fuel was 3.6% with viscosity at 8.7
at 203166 miles fuel was 4.3% with viscosity at 9.4
Previous to the 188474 analysis the fuel was less than 1 since new
Dealer says this is normal. I find it disturbing that there was a step change after 11 years.
Oil has been changed by the dealer with the exception of a couple changes at the first year of service.
Oil is motorcraft 10W-30
I am no expert on the metal and additive levels but they all seem to be consistent. I had a batch of new oil analyzed and use that for comparison.
Do I have a problem?

 

That is higher than I've ever seen in my truck. With fuel dilution that high, you should be running 5w40. Do you track your regens at all? Do they finish when they start?

Does the truck idle a lot? When do you change the oil? Provide some details here so the community can respond.

 

dont know what the ford spec is for allowable fuel dilution in oil...not that I would agree with it anyway.....

I have found my 6.7 to make oil...I fill oil on the low side (very tip of the dip stick) and watch it quickly creep up the dip stick within a few thousand miles. so yes...there is some fuel dilution into the oil going on.

but...ford has a clever invention to hide this so that most folks dont know whats going on....as the oil level rises due to fuel dilution..there is a hose connected to you CCV that sucks oil into your inlet...so you are continually burning off the excess rise on fuel diluted oil. but...there is a back order of 500 engine blocks for blown motors due to oil starved internals that tells me this whole thing is a risk transferance to the customer.

as previously stated decide what oil weight is good for the service duty you use. obviously, weather temps play a factor in the oil choice..but the thickest oil possible within the weather range will offer a greater buffer from fuel dilution. 5W30 or 5W40 may not be the best option. you definitely want to switch to severe duty schedule.

 

This is the #1 reason I'm running 5k oil changes. Doesn't matter how good your oil is if there's too much fuel in it.

 

Mine's never been that high...

 

Do you track your MPG? If not, maybe there is a leaky injector and you aren't catching the loss of MPG. A sudden increase in fuel dilution is a red flag that something in the fuel system isn't Kosher.
The 2012 I had, the last oil change showed <0.5% fuel dilution over 6200 miles. If the next change showed 5.9% I would be worried as that is a HUGE increase in fuel. It would be akin to someone dumping a cup of fuel into the engine block.

 

NOT if you run a Mishimoto oil catch can...

 

I change my oil at 6000 to 8000 miles
Avoid biodiesel but have used a few tankfuls in the past due to that is all they sold in California where I refueled.
Mostly highway miles. No excessive idling. Always drive long enough to get temps up to normal.
Have Banks iDash monitors. Always allow regen to finish if underway.
I just completed a 2500 mile trip after the last oil change. I will have the oil changed and analyzed. What other options do I have for analysis other than LubeWatch?
I had good fuel mileage on the trip (from 17 mpg to over 19mpg) That seems to be the same since the truck was new.
.

 

I use BlackStone Labs. I don't know, but it may be better to stay with one lab? That was at least the testing standard is the same each time and you can monitor trends better than using random labs to analyze samples. Just my opinion... Another option though may be to send out 2 samples at the same time, one to the lab you are currently using and then the other to another lab, then compare the 2 reports. Also, have you tried contacting the lab and discussing the findings and the trends from the previous samples?

 

how many miles/hours and idle hours on the motor.

reduce your oil change interval to 5K.