Originally Posted By: motor_oil_madman
This truck has always had about 1-1.5 quarts extra when I change the oil.
Now, if I understand your comment correctly, you're saying you always get 1.0 to 1.5 more qrts out than what you put in? Or, are you saying you always put in a bit extra?
Quick math in my head here, presuming you're getting out more than you put in. The ISB takes 14 qts or so for OCI right? And you get "about 1 - 1.5 qts extra" out? Would that not be 10%? Would that not be just about the same fluid volume as your 10% fuel dilution?
Perhaps the UOA and your OCI volume are trying to tell you something!
You're presumably still under warranty. Here is what I'd do:
Do an OCI immediately with some cheap dino oil. Then do it again about 500 miles later for a complete flush; put the issue to bed so that you can start "fresh". Then, put in some quality dino oil and run 3k miles; measure the exact amount that goes in. Then at the end of the 3k miles, do an OCI and take TWO samples from the same load, and then send them off to two different labs. Fuel dilution is pretty much undeniable and undebateable. Between the lab results and the OCI volumes, you should know if you have an injection issue.
If you have a dilution issue, I'd seek warranty help asap.