One more thing, a couple weeks back, I was also 2.5 quarts low on oil. I was at about the 65% mark on the Oil Life, for me that's about 4,500 miles. The oil light actually came on. I have not had this problem before. I'm using Mobil 1 extended life full syn in 0W/20 with a mobile 1 extended life filter. My commute is 43 miles each way, all highway.