The owners manual lists 8.5 quarts. That's if you change the filter. 7.5 if you don't. I use Penzoil 10/30W. I use Mobile 1 in my other vehicles, but the synthetic (IMHO) is likely to seep through the seals on the older engines.
I use Valvoline Max life and have been very happy with it. It contains a seal swell agent as well as other goodies to help condition your seals and a little extra detergency to help keep the crap buildup out of your engine.
I agree with John, 7 quarts m/l. I overfilled once and had oil leaks that were not there before. The newer oils for "high mileage" engines have a component that swells the old dried up seals, They are actually OK, in my experience. The foreigners used real rubber instead of neoprene for seals and some chemical in those oils actually swells and livens old seals.
I have an "F" engine, and for sure it is 7.5 quarts for me with the filter change. I have tried more, and it is too much. Don't know how they came up with 8.5, but it is wrong. And you really don't want to overfill.
Just a small point and not really that big of a deal, but the oil filter sits upside down and drains out. Check the oil after it's sat for quite a while (over nite) and it's probably not so bad to have the oil just a tiny bit above the full mark, 'cause once it starts the filter will fill back up and the level will be lower while it runs.