Which is the better way to go? Frequent oil changes with a good quality oil (like Chevron?), a good but low cost oil filter (like the SuperTech oil filters at Wal-Mart), maybe 3 oz. of Auto-RX in the oil, and 2000-3000 mile oil changes? Or extended oil changes using something like Schaeffer's Oil, a high quality oil filter (like Mobil 1, K&N, Amsoil), maybe 3 oz. of Auto-RX in the oil, and oil changes of several thousand miles?