Just bought an 04 excursion 4wd with the 6. 0 Powerstroke. Found some oil in the hose connecting the intercooler to the intake. There is also signs of oil on the hoses from the turbo to the intercooler. Is this a leaking oil seal in the turbo or what. Its going to the dealer next week and I want to make sure they dont try to pull the wool over my eyes.