Not sure if this is the correct place to ask.
i bought a 2018 Sierra yesterday. I got almost 17k off the msrp. The truck is considered new. It had 26 miles when I left the dealership. Anyways, I asked the salesman about the warranty and he told me it started the day the truck was put into service. I then proceded to tell him that when I bought my last new truck (2015 Sierra) the warranty started the day I bought it.
He went and asked his manager when the warranty actually starts and the manager said it would start the day I bought it. I called GM customer service and they told me that the warranty had started in September 2018, which was when the truck was put into service. Im not sure what to do. Has anyone else experienced this?