You can download a copy of the owner's manual for your 2008 Ford Fusion here https://owner.ford.com/your-vehicle.html
Ford recommends using Motorcraft oil and filter because those are the OEM-specified parts.
MotorCraft is the name for Ford's specifically-branded automotive products. As long as you are using the correct type (traditional, semi-synthetic, or synthetic) and the proper grade (whatever is recommended for your vehicle), you should be able use any brand of oil in your 2008 Ford Fusion.
For additional assistance, please find an AskPatty Certified Repair Shop at http://www.askpatty.com/search/?type=all&m=30&q=&keyword= and they can help you with the oil change for your vehicle.