I am pretty sure you posted in the correct section but to remove all doubt...
You don't happen to have a new 6.7L powered super duty that has an air to water intercooler, and 2 seperate coolant systems?
Like I said just trying to remove any doubt, where I could imagine some fresh owners coming in here and wondering about "intercooler fluid" thinking of the secondary cooling system.
Well if you have a 6.0 chances are your intercooler has a bunch of oil in it. LOL
That ain't no joke for sure :doh: