NHTSA Complaint #11555219 — 2016 GMC YUKON

My 2016 GMC Yukon Denali was taken in for a tune up. When I received the vehicle back, I was told that there was possibly a microscopic pin hole in my engine because fluid (engine coolant) was under one of the injectors. I was told that I may need to trade in or get another engine. I refused both. The mileage at the time was probably 120,000. I purchased this vehicle brand new and do not see how an engine is needed so quickly. I was barely finished paying for it. I was told by a co-worker that she had to trade hers in because it was doing the same thing. She had also investigated and had learned that many of these vehicles have the same issues around 114,000 miles and beyond. I think these issues need to be addressed.