Indeed that photo makes me laugh as its almost comical in a sense when I think about Christmas at a certain brother inlaws as he turns on the tv and puts it to the burning fire place channel, an image of reality but yet far from reality in what it accomplishes in any physicals sense.
When I search for answers to what is the optimum oil level in which to run an engine, of no surprise it states that its NOT ideal to run the engine constantly at the add mark but IS ideal for the longevity of the engine to run the oil level at or near the full mark on the dipstick. While its fairly typical although not written in stone as per the one quart difference between full and add on what I would refer to as a full size vehicle engine, as one goes up in engine size for trucks, field tractors, other industrial equipment etc and the oil capacity increases they stretch out the volume between full and add. Typically highway tractor engines tend to be a gallon of oil and that may be 1 tenth of the total engines oil volume. Looking back at the older GM full size pickup engines, some of them only held hardly over 4 quarts ... that 1 quart low was taking 25% of the total oils volume away and no wonder they started bumping up the total oil volume with a larger sump on pans for the same engine platform to help the engine and retain the oils integrity to increase the odds of the engines life span.
Note my quotes around "a quart low"
adding 1 oz when at the bottom of the crosshatch/acceptable range would bring it back to within the acceptable range therefore it would not be considered a quart low according to what the manual calls the acceptable range even though you can add a quart and not be over filling at that point.
I was explaining why the manual would not say the bottom of the crosshatch is a quart low.
So they managed to get GM warranty participation on it? Nice.
The "warranty" they are telling you though...doesn't sound right. GM OEM replacement parts are only a 2 year/unlimited mile warranty, except for some select items that may have a limited lifetime (wheel bearings and a few other things) and accessories. So the cam, lifters, etc. would only have a 2 year/unlimited mile warranty from GM.
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