Oils with higher percentages of PAO base oils tend to produce more pronounced lifter noise. Many people over at BIOTG have noticed the difference in sound between running M1EP 0W-20 (70-80% PAO) and M1AFE 0W-20 (30-40% PAO). UOAs look very similar and I’m not implying there is something wrong with a higher PAO base. I just prefer the quieter, oil made by Valvoline. No need to get uppity.As long its got 0-16 on the label I am good with it, you can argue all day about who makes the best synthetic oil & to have someone to say there's run quieter in the engine than the other I call bullsh*t prove it.