My 2015 6.2 Silverado just did this. I parked it , but did drive it around the house trying to figure what was wrong. Tore it down ,#4 & #7 bent pushrods. I'm bummed out, changed oil and filter early every time. Never abused it. I was quoted 8k dollars to fix it. Needless to say , it is sitting in my garage torn down to the short block. I would not drive it , could turn into a really big job.