i bought my hyperlube at auto zone,got a 91 ranger 6cyl n 93 4cyl ranger,i usede to drive 4cyl in the winter and the hyper lube made that engine tick untill it warmed up,but summer time driving ,i can tell and feel the difference in both trucks,i love it,the 6cyl truck ticked also in the winter untill it warmed up,now thats my high mileage trucks, so what i do i run lucas synthetic additive for winter,just perfect.im not cutting hyperlube down ,i ll always use it in the warm weather