Glad to see a positive note on syn oil. The trend has been and will be to move more cars and trucks to a synthetic fill from the factory. Gm has a oil life system on most of their vehicles, which alerts the owner to the need for a oil change instead of a mileage/time type change interval. I have read these systems will and can go 10,000 miles before the light comes on. By using synthetic oil you can go the distance and not worry about engine problems.