Well, you shouldn't have anything to worry about as long as your maintenance program is good. I'm currently at 319,551 km (198,560 miles) on my 2008 6.2L and 277,359 km (172,343 miles) on my 2017 6.2L. Granted one is non-AFM and the other is non-DFM, but with good service they last. I plan on trying for another 100k out of the 2017 when it becomes my daily driver and the wife gets something different.
I'd say for the astounding cost associated with buying a GM vehicle in Russia, I'd run that thing for a while yet. Parts and maintenance are cheap in the long run......especially in your case.
The purchase price in the US is simply the entry level to buying this car. For example, my 2022 Yukon with 120 thousand km, or 75 thousand miles, I can easily sell it now for about $125 thousand)) and by paying only $25 thousand more get a new 2025 Yukon)) We only live once, I want to drive a new car) Yes, I pulled out a lucky ticket with my 6.2 engine, but who knows will it withstand me after 200 thousand km)
In my experience, with my mode of car operation, which is fast driving, and mileage per year is about 35-40 thousand miles per year, after 125 thousand miles, automatic transmission repair is already required, and average engine repair. According to my estimates, this can cost 20-25 thousand dollars. So it seems easier to me to pay the same 25 thousand dollars, and drive a new car))