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ok.... being that overfull wont' cause a problem unless it's so full that you're getting excessive oil through the crankcase breather.... on these engines, that's a LOT of extra oil....
black smoke denotes that you're running rich, not burning oil. When oil burns, the smoke will have a blueish sometimes light greyish color.
someone would have had to make a HUGE mistake to have put in more than one extra quart.... as on average most cars take 4-5 quarts and trucks tend to take a bit more.... the 4age takes between 3.5 and 3.75 to "full"... but even I have had more than that and no problems. It's actually also somewhat common to use a little more oil to help when cornering (for those that don't have sump setups).
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