Tonight I completed my weekly fluid check in the '99 Corolla. I changed the oil with Mobil 1 0W-30 AFE SN the beginning of September and have since put 1300 miles on the oil. The car has been sitting for the last 36 hours and when I pulled the dipstick my oil is still golden brown. Normally with the other synthetics I have used (Edge, PU, PP) the oil is turning black by 1000 miles of use. Now I know that the visual look of the oil is by no means a good indicator of the oils condition, but I found the fact that my oil is still golden brown as interesting. Could it be that the new SN's formulation with its lower calcium and higher magnesium result in less cleaning of the engine? Also my Corolla is one of the notorious oil burners and I usually burn about 1 quart every 1000 miles with the other synthetics (Edge, PP, PU). However, with the 0W-30 AFE I have only burned a half a quart in 1300 miles. I was almost sure that the thinner 0W-30 would have burned more quickly. What are your thoughts on the color of the oil and slower consumption rate at 1300 miles with the 0W-30? The car has just over 130,000 miles.