I had two crank seals go within the first 1k miles on my 2020 3.0 Duramax. First one was supposedly a bad install. It's at 25k and at the dealer for a glow plug code. I started shopping for extended warranties but I'm torn on which way to go. GM or aftermarket my dealer sells. Or scrap the whole things and get a 22 2.7 gasser. Looks just as capable as the 3.0.