Relating to this topic i have 2015 5.3
lifters done at 220,000km and then went again at 335,000km limping it home on 7 cylinders for 21hr drive ecm shut down cyl 6
pulled motor and replaced with a 80,000km motor and was able to start tbis engine showing 275kpa hot
now installed in my truck it shows 1/2 that value using dealer supplied oil n filter. I plan to old skool my original engine and run with my existing tune cutting out v4 mode i tweeked my trans and deleted my downstream o2’s
runs great with the open exhaust as i have gutted cats