This is the Mobil 1 AP 5w20 UOA, I have filled my Jeep with this oil on April 9th and drain it on September 1st. The reason why I am draining this oil half way of it claim 20,000 miles because it have been though serve usage, I have used my Jeep to tow 7,000lbs for 2,800 miles on the oil from CA to VA. I have to add .5 qt in Texas and the other .5 qt once I got to VA. The sodium level may be because I have used NAPA Synthetic oil second change before this. Let me know what you guys think about the result.