Well I followed this thread back in late 2018 when my lifters failed in my ‘16 Yukon Denali at 29k miles. The replaced it and I always knew something wasn’t right. Here we are not even 23 months later and 13k more miles and the same cylinder 6 lifter has collapsed again. So twice the same lifter has failed in uncertain 43k miles. There is a fundamental flaw with this engine. This should be a class action lawsuit.