1) Oil is 5w30. Just a hair under 5 quarts with a GT...Filter is a Toyota F1. Brand is your choice. There's really no difference one way or the other anymore. 2) Gear Oil...Syncromesh. It takes about 2.3 quarts. 3) Coolant. Toyota pink.
The owner's manual lists all of the GM specs...Most recommend to follow Toyota's specs for the coolant and other fluids.