I'm calling BS on this answer as well. The parts manager actually had to argue with the service manager on which oil to use when I had my last oil change. The parts manager made sure for me that the full synthetic was used. I don't trust the service department to use the correct oil on their own.Had my oil changed today in my 2018 f150 and the dealer used xo10w30qsdf instead of the recommended oil. I asked them about it and they told me Ford changed the recommended oil after I bought my truck. Will it hurt anything to leave it in there?