I understand what you are trying to do but realistically probably dont need to convince folks how you know better etc. If you want to overkill the engine do so but we dont need you telling everyone else how this is the correct way outside of what the manufacturer recommends.
I too was a gm heavy line tech and there is no way I'm recommending anything to customers or friends outside the scope of the manufacture. You open yourself up to all sorts of liability. And when things go side ways no one is siding with the customer because they did something stupid at the behest of some random person on a forums.
What works for you is great. Share your experience. But dont come here convincing everyone how GM is wrong, engineers are wrong, their eyes are wrong, the dipstick is wrong, the design is wrong, but only you are right.
Just my 2 cents.
Appreciate your 2 cents, but something is CLEARLY wrong when the manufacturer delivers and engine with an oil level that is "above spec".
I have been in many industries and I have seen many "specs" be wrong, misprints typos and so forth.
GM is not going to be putting in extra oil in millions vehicles, they would not want to spend the money or they could save plenty of money depending on how you look at things.
I do not recommend anything I would not or am not currently doing. What I am suggesting and doing is not going to cause catastrophic failures and damage. Everyone is going to do what they want to do with their vehicle.
I initially asked if anyone else had seen a similar situation and like all good Internet and Forum members I was immediately roasted and continue to roasted. But guess what I not only have thick skin this ain't my first rodeo and I do my homework. Few have actually objectively looked at the situation, they just repeat "spec says". Well if that is how they roll, nothing I can do or say will help them.
But like anything, everyone has their opinions.
I think most would agree the dipstick design sucks and is misleading regardless of what the "spec" states. But at least we still have a dipstick to use, so many of the newer vehicles have no dipstick and you have to rely on an oil level sensor that hopefully works correctly.
We will see if this thread dies, but I am holding by footing on this and I have had other 6.2l owners that I pointed this out to, they did their own oil changes, started out with 8 quarts and using their own eyes and judgement came to the exact same conclusion I did.
But hey, its just an oil change, nothing special!