2013 GMC 1500 longevity?

marcsbigfoot20b27 wrote:

Grit dog wrote:
We did just have a 5.3 go down in a 2012 pickup at under 100k miles.
Dropped a valve or something, haven't seen the diagnosis, but noone could swear one way or another how the truck was used or maintained, since it's had about 5 different primary drivers at least and who knows how many others.
I think it's an anomaly though.

Most likely due to AFM Active Fuel Management aka cylinder deactivation.
Many of us have this disabled in a tune.

The way my mechanic explained it is when the cylinder is deactivated the lifter chatters on the cam causing ware on the cam. He has rebuilt 4 of them for companies around here. He personally bought a Chevrolet truck that had this issue and put in a new motor for his daily driver.