Engine was misfiring last week, so I brought it to the dealer. They confirmed that I had a collapsed lifter, and that it had to be replaced under warranty. When going over the repairs with the service writer, they informed me that they only replaced the failed lifter. Out of curiosity, I asked him what such a repair would cost outside of the powertrain warranty. He told me it would cost anywhere between $3500-4000 if it happened again, and that all of the lifters would need to be replaced should I be paying out of pocket. He added that I would be "silly not to replace them all" due to the type and magnitude of service, and because of the likelihood that another fouled or damaged lifter could fail shortly after the first. GM only authorized the dealer to replace the single failed lifter in my engine.
I drive for work, and already have 45,000 miles on my 2016 Sierra. I am happy to let GM replace as many lifters as need be on their dime. That said, as the end of my 60k mile powertrain warranty nears, I am worrying about long term reliability on this truck. I have maintained it meticulously.
What are your thoughts? Since I've had a lifter failure at such low mileage, are there high odds that another will fail on me soon, or at all? Should I dump the Sierra and get another 5.3L? Would a Denali with the 6.2L be more reliable? The styling and interior of this truck have made it my favorite vehicle ever, so I'd hate to see it go.