My 2016 Silverado L86 failed at 102,000 miles 2 weeks ago. It doesn’t matter what year it is, how often you change the oil and take care it, it’s going to fail. These engines are a ticking time bomb and GM has known it for over a decade.
Personally, if it's anywhere on the upper 3/4's of the marked area I'm not adding anything, to avoid the 'risk' of overfilling.
If I am close to oil change time, and it's at the bottom of the marked area, I still might not add any. For this to be the case (which it never has) the engine would be consuming an amount of oil that I am no longer worried about the longevity of it.
Recommended Posts