I just got my 2017 in April and went cross country over the summer. Well..now I have 18900 miles on her. I've stayed on top of the maintenance, but I've run into this problem where for the second time, I've taken it to a shop for an oil change and regardless of the fact I've said "full synthetic" the put in conventional AGAIN.
The other time this happened was the second time I got an oil change, the third time I talked to the mechanic and he said it wouldn't hurt to go full synthetic again since it was only once. But how about now? Can I go back to full synthetic, or am I stuck using conventional now?