On the PU questions, and answers the charts had up to 5 star ratings on PU, PP PYB etc... on the issue of high mileage, seal swell, etc etc PU gave no stars at all as a high mileage engine oil. Maxlife is one of the best oils for a true high mileage engine that needs these things so I would stick with maxkife,,, not only that maxlife is a outstanding regular no frills oil to run just ignore the high mileage advertisement part of it, run the oil as a top tier oil..... I ran this oil for a long time because I like the oil itself not the high mileage part of he advertising.