Well, I woke up this morning and suddenly realized that all thinner oils are better than their more viscous counterparts. My new Toyota Rav4 with the 5w20 & 4cyl is by far the quietest and smoothest engine in the fleet. All others are 5w30. I do believe that oil flow is the key to less wear and that all cars should be switched to 0w20 and that the oil manufacturers should seriously consider a 0w10 or even a 0w5 oil for all the new vehicles.