I had pondered the thought of purchasing a new $60k+ GMC Sierra 6.2, but after talking with some GM mechanics and reading these GM truck forums, I’ve yet to do so. I just keep plugging along in my 1999 5.3 Silverado Z71 with 320K on the odo and no engine/tranny issues whatsoever, and a REAL throttle cable, not this DBW electronic bullshit. Original paint, no rust, just normal wear & tear parts replaced due to age. Luckily, I was able to save $$ by replacing most of the parts myself vs $120 an hour rate.
These modern 6.2 engines are total junk and that includes the 5.3 as well. When I was at a local GMC dealership browsing new trucks, there were 3 fairly new trucks in the garage bays for lifter failure, one of which was catastrophic engine failure. All were covered under warranty, but now you own an unreliable POS. I guess it’s just brand loyalty these days that keeps the buyer coming back, even if it’s junk. More scarier than that was what a salesman told me that day: “It’s HP & displacement that sell a truck.” Oh well, when that day does come, “crate motor, here I come!”