My 2019 new body style silverado LT 5.3 with dfm 4000 miles on, not even had its first oil change , had a p300 and a p306, #6 cylinder misfire , collapsed lifter, they replaced 8 lifters on that bank.
I installed a oil catch can on my 2019 silverado LT 5.3L from JLT performance, and after a couple hundred miles I checked it and there was oil in the catch can, not much, but a little. I'm sure after a couple thousand miles it will be full.