i was skeptical for a long time, but put some through my 97 cobra, the symptoms i had were it cutting off when engauging the clutch w/ the a/c on and low idle, raising the idle manually didnt help the car cutting off from the a/c, ran a can through the car, let it sit a while, fired it up and smoked like all hell took her around the block and by half way around my idle was back to where it should be and the car would purr w/ the a/c on when i engauged the clutch, i changed the plugs 2 days later just to be safe though and the same as above w/ the oil