Well. I just had a idea before I went to bed. Lets say I had a brand new car. I break it in and change the oil every 1,000 miles until the car has 3,000 miles. Then I add Mobil 1 or Amsoil to the crankcase. After 3,000 miles, instead of changing to fresh oil, I change just the filter and refill it with oil to compensate what was lost when taking out the filter. Then when the car hits 20,000 miles, I do a Auto-RX. After the whole thing is completed. I do the whole thing over again. Good idea, or im I crazy.