My vehicle was 8 months old and it completely stopped with no warning going down the interstate, I was in the left lane and the vehicle locked up, engine and all leaving me stranded in the left lane on a busy interstate. When the engine quits, there is absolutely no way to get the vehicle into neutral to get it to a safe location. When this happened I was almost hit by an 18 wheeler . After having the vehicle towed to the dealership, they informed me the engine was seized. It took 3 months to get an engine from GM, they finally got the engine in, started it up in the shop, it apparently ran for about 15 minutes before losing oil pressure. At that time they shut the vehicle off, pulled the oil filter, found metal shavings in it and GM told the dealer to order another engine. But there were no engines available. The dealership finally notified me 3.5 months later that they finally received an engine and were working on installing it. I finally got my vehicle back after more than 6 months at the dealership and it was on its 3rd engine. I drove the vehicle for almost 2 years before the Same thing happened, the vehicle locked up on the highway and I had to have it towed. It has taken the dealer over a month to diagnose the problem and called to inform me the engine had seized up again. This will be the fourth engine in a 2022 GMC Yukon AT4. Besides the issue of the engines going bad, it is a severe safety issue that the vehicle will completely lock up on the highway with no way to move it. Twice I have almost been in a serious accident because of this.