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No, the filter does not take a full quart, I can only put at most 1/2 a quart of oil in the filter ( I use Fl-1A's). Any more and at the angle the filter is in, the rest will spill out all over. So your saying that the straw takes 1/2 quart? Possibly.
So if I speculate 5 (as the manual says) plus 1/2 in the filter, it's at 5 1/2 quarts. Anybody ever put more than 6 quarts in by accident? I've put in 6 1/2 quarts by accident, still on the line.
I've changed oil in this trucks at least 100 times, surprising enough, every one is the same way, although I prefer the angle the 300's is at, over the 302 or 351.
for me, it was 5.5 quarts to get it full after changing out the oil pump and oil pan. meaning it was about as dry as the day it was filled at the factory...