I have NEVER used Mobil 1, and never will. And ALL of my automobile engines run perfectly. No engine uses oil, and some are up to 290,000 miles, with no engine work. Valvoline synthetic is $19, and my favourite: SuperTech is at 17.50. I have always had excellent results with SuperTech, even though it has a phony sounding name, it works 100% just as good as the vaunted Mobil 1.
I have never had to do an "engine cleaning", never used any snake oil additives, just changed regularly, depending on weather and driving conditions, 3000 to 6000 miles, and filter EVERY OTHER time.
Motorcraft 5w20 is an excellent oil, to mix 50:50 with Supertech, to get a kick @ss 5w25.