I've been driving Fords that I bought new for over forty years now. The factory manual will not steer you wrong. Current models no longer require the 30K mile fluid changes that were once the norm. So many products advertise superior performance but do nothing more than get you hard-earned bucks. Go with Motorcraft parts and products at the scheduled intervals and you will be pleased. There are recommendations for hard service applications.
1989 Blue LX Hatchback
2001 Red SVT Cobra Convertible (Phoenix)
2002 Black/Red GT (Ginger)
2011 Red Candy Metallic V6 (Manfred)
2016 Magnetic Metallic GT (Susie II)