My 2017 5.3 with 33,5xx miles on it is at the dealer now with a ticking lifter. Service Advisor called late in the day 10/12 said parts ordered, but 1-11/2 weeks out due to being back ordered. Didn't say which particular part was back ordered. Took the truck in AM of 10/12.
A little back ground, dealer oil changes ever 4k since new. And a Range V8 since 3500 miles .Truck does see alot of short trips as it's my run around the farm truck. Usually my wife takes it in for oil changes, and I just check it to make sure the oil filter isn't leaking and the oil level is correct when she brings it back.