I pulled my truck apart today to replace my A/C compressor and to flush my cooling system. I pulled the A/C condenser (to internally and externally clean it), radiator and I decided to also pull the intercooler. when I pulled the intercooler, I saw some oil in the turbo side of the intercooler and the piping from the turbo to cooler. I also saw some in the cooled side tube. I have 60,000 miles, truck signature below. I am still under the extended warranty (engine and drivetrain). I want to put a better turbo maybe the Garrett ball bearing model. Is this oiling issue normal?