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Well - since new, I have only filled mine to the very low side of the hash marks while hot, it is about 9 1/4 quarts.
Why? I find that the amount of oil vapor is greatly reduced in the PCV system. When I did my first couple of oil changes, I was pouring in 10qts, but saw the oil volume in my catch can go way up right at the oil change.
As have dealing with these kinds of issues on other vehicles before, I let the car kind of tell me where it wanted the oil level - which settled in right between the lower hash mark and the tip of the dipstick. This took almost 5000 miles to happen, but once it did, the amount of oil in my catch can went WAY down.
But the debate is over about the terminology of "Capacity" vs "Fill". Yes - the manual says the capacity is 10 quarts, but you are not getting 10 quarts out when you drain it.
I recently tore my engine down as to go with forged internals, but even after 2 days of letting the engine sit on the stand with do drain plug in it, there was still every bit of 1/2 half a quart or more of oil inside it. The valleys in which the lifters ride, the cam, the DOD system, and the oil bypass system were still full of oil.
I doubt that when you drain the system you are getting any more than 9 to 9 1/4 quarts out of it. If you are pouring in 10 quarts, you are probably 1qt over full
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