All Direct Injection engines risk carbon build up on their intake valves.
Adding fuel injection cleaner to the fuel won't help prevent this because the fuel is being sprayed directly into the cylinder.
From what I have researched a "walnut shell" cleaning service can successfully remove the built up carbon from the intake valves. However this service is much more expensive than a bottle of Techron.
Perhaps, especially as noted since this post in the days of smaller capacities.
I haven't seen any data or official publication describing or acknowledging the same - especially in the last decade.
I posted it already, but, yes, when level falls below (point of semantics, below, not, to) the marked area, add oil. Never add oil above the mark.
Given that above the mark is just as dangerous as below the mark (per the manual, not exactly my opinion) to keep the level at the top of the mark, or full, could be just as risky as at the bottom of the mark.
We'd like to learn more about your tailgate concerns and look into it alongside your dealership, Jim. It is important to us that all your electronic components are operating as designed so you can continue enjoying your truck. Please fill out our support form (https://s.gmc.com/support-request ) with your username and additional details about the tailgate.
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