I recently found an autozone in my area that carries both gc 0w-30 and bc 5w-40. The question I have for the castrol veterans is which would give the best overall performance and protection in a 1.8t? The car has no consumption issues and has almost 100k miles on it. I am just finishing up an ARX rinse and am trying to pick the best synthetic oil for this car. Any advice would be greatly appreciated.