Originally Posted by UNKNOWN_370

Well it is highly recommended not to go back once you use Syntec. I'm not sure of the possible repercussions but I would immediately get synthetic back in. So go back for an oil change IMMEDIATELY.
Its your responsibility to tell your dealer what's in the car, but! At the same time. If you are using the same rep everytime you go? And you been using synthetic. He should have caught it in the computer. I don't know how liable they are but I would make them put synth in for free because they also should have asked. They extended you a warranty and its there job to ask what you use.
Does that make them liable??? Probably NOT? But both of you guys messed up. So see if they will make right on your oil? You may get lucky.
Your oil changes aren't free though. They are rolled into your warranty. So essentially, you paid a pretty low fee for your warranty. At least that much.