I phoned the 800# --the rep told me that the its a mixture of 90% group 3 and 10%PAO(MOBIL 1)--This was both formulas--the "newer"car 5w30 and the 10w -30 hi-mileage----for $2.42 a qt. at walmart-----how does this formula stack up the other synthetic blends and hi -mileage formulas?