Lost my ‘12 5.3L to a stuck lifter. 144K miles. Religious M1 oil changes every 5K miles. Used the AFM delete plug for maybe 60k of those miles. Curbed some of my oil consumption and actually improved my MPG, especially on the highway by 1-2 MPG. Lost an ‘08 5.3L at 88k miles and it was drinking oil all the time. Had enough with GM and moved to Toyota. This 5.7L might not get the gas mileage but is stronger and doesn’t drink a drop at almost 80K.
You didn't lose either engine, They needed to be repaired via AFM Deletes.