2004 Lariat-51,000 miles-5.4 3 valve engine Currently I am using Mobil1 0w40 to clean out my engine. At 3000-5000 miles I will drain it. I want to use either CASTROL Magnatec or CASTROL High Mileage oil. I was told either one of these oils will help keep it quiet. They are both the same price at Walmart. Which one would you use?