This came from the ford parts website, and to the best of my knowledge I believe it to be true:
"Nothing beats an original. Genuine Parts and Motorcraft® are designed for Ford, Lincoln and Mercury vehicles. Manufactured to strict specifications, they have undergone extensive laboratory and on-the-road testing. They're built to maximize the performance of Ford, Lincoln and Mercury vehicles and provide the confidence the repair will be done right the first time."
found at this link:Ford & Motorcraft Parts List | Lookup Motorcraft Batteries, Oil Filters, & More | FordParts.com