well i used it an i can tell a difference, i race my brothers silverado all the time and with out nos its about dead even, last month i didnt use mobile 1 synthetic or the restore and he beat me, not by much but he still won, Im not saying it was all the RESTORE in my motor, but it does seem to feel like its smoother and running better, also if you can make the motor slicker inside you will get power, my .02, 8 more rwhp by using moblie 1 10w30 synthetic instead of using 10w40 castro, So just thought you guys who want a little more power, spend the little extra on some mobile 1, or any other synthetic, i just know what Mobile one did in my explorer, also it seems to stay cleaner around the 3k mark, that with a fram double guard on there and you get some more power and miles out of you motors,