What's all this talk about oil viscosity? Use what Ford recommends, 5W-20, they built the damn engine, they should know what kind of oil to put in it.

I use any reputable brand oil that may be on sale, as long as it is the viscosity the car maker recommends, in this case 5W-20. I have always preferred Pennzoil and have used for over 40 years in my cars and never had a problem. Actually Pennzoil and Quaker State are the same oil basically, they merged quite a few years ago. I never figured out the advantage of using synthetic oil instead of regular oil, to me it just seemed like over priced oil and since I change my oil every 4000 miles, it seems like a waste of money.