I don't have my owner's manual with me, mine is a GT, but GT does not have a different manual.
10W30 is recommended for most temperatures.
Mine has been run on 5W30 for over 100,000 miles. Even above 100°F. Granted that has been synthetic. Mostly Quaker State Syn but a few Mobil 1 changes and a Castrol Syntec change when the prices were right
4.5 qts + filter. A 5 qt jug takes care of it. I have to use all 5. Turbo takes about 1/3rd of a quart more. You should have a little left for topping off.