I have a 2012 Duramax. 2023 I had REALLY bad luck. The turbo stuck open pumping a lot of fuel into the engine. The killer was the #2 injector went bad and apparently was wide open. So the cylinder got flooded and washed the oil off the walls and eventually scored the walls. Found pieces of metal in the pan when all was said and done. No new Duramax from Chevy available, so found a used one with 60k miles. Shipped in a wooden crate, but upon delivery it got dropped and dented the pan and broke off a few external parts. So we used some parts from the old engine and got on the way. A thousand or so miles later fan belt kept shredding or disappearing! Apparently the fan got bent when engine dropped. Eventually replaced the fan (after it got sent to Memphis instead of Bozeman!
That was a real fun summer. I was hoping for the expected 200K or more from the Duramax. Oh well.