when I had my 82 cutlass (and you'd better believe it got changes as required), I used maxlife in it - and it made a noticeable difference. I had some pretty worn rings and shot valve seals, and when I started using the maxlife, it really did restore some of it'* kick.
so I guess it depends on if your car is in good condition or not. newer cars (to me, that'* anything built after 1989
) might not have the wear and tear to really make a big difference. if you've been taking care of your car, you'll probably be just as good with any other oil (though I highly recommend mobil1).