I agree with Charles that its thinner or watery. have you notice all the walmart oil is leaking oil I can feel it when grabbing the quart of oil. My truck leaks a quart of oil every two weeks because of my cooler lines leaking, if I use walmart oil versus Mobil I need to fill it almost like week! Walmart oil seems to be thinner and no consistency.
A walmart worker 5 years ago scan one of the bottles and I think the scanner said that walmart was made from Exxon.