Disable auto start/stop with a plug-&-play module, I have a 3.0 diesel and I think it’s one of the best powertrain. However, I don’t have a lot of miles, I put 11,000 miles on 2021 RST diesel Suburban, and now about 10,000 on my 2023 Yukon XL SLT diesel, and had no emissions or engine issues...