Assuming you have an EcoBoost motor in the F150, I would recommend Quaker State Euro 5W-40 if you can find it in the API SP version. Lots of Walmarts still carry it in the API SN Plus formulation. Considering that an EcoBoost motor is a soot-generating machine, I highly recommend an API SP-rated motor oil. Skip Pennzoil Ultra Platinum. If you have to have Pennzoil, I would stick with their Platinum line of motor oils, it's actually better. The Ultra Platinum line is consistently being neglected, and IMHO, Pennzoil is trying to just kill it. Look at the lack of certifications and approvals, not to mention that any oil in their Ultra Platinum line above 5W-20 will shear down pretty fast. It's not all about oil viscosity, the formulation is also very important. Also, consider the fact that Motorcraft worked for you well for so long, there is no reason why it wouldn't work from now on. I used to be a thick oil guy and I thought that I always knew best, however, after I learned a bit more I realized how little I knew about motor oils. These days I don't advise anyone to make drastic changes if something works for them. Also, a motor can almost never correct a flawed engine design. For my 5.7 HEMI going to a 180F thermostat, doing a grille shutter delete, and using a bigger oil filter did more good than going to 0W-40. So now I will go back to 5W-20 on my next oil change because I want a better MPG, especially since I no longer have a hot running motor. Good luck!