Dealership put in Zmax during an oil change

Togo

I usually get the first, oil change at the dealership on a new vehicle. Just so that if I ever make a warranty claim they can't say **** about improper regularity with my changes. After that I do them all myself. I also save the receipts from my oil and oil filter purchases with the dates printed at the top and write down the milage on them at the time of the change. I've never had to have warranty work done on a engine but in the event I ever had to I wanted to have as much information I could about previous maintenance available to me.