So I have a 2015 longhorn ecodiesel and just had to do first oil change. Dealership put in pennzoil, this is ok correct? I know I've read where something was changed and now they want shell rotella oil. Should I have it changed or is it gonna be ok? Thanks in advance
So just had oil cooler go out on it and dealership claimed they changed oil and flushed coolant system, but coolant reservoir is still black. It's not frothy but definitely oil in it. I just purchased truck a month ago and repair was done under factory warranty. I have 100,000 additional...