I vote yes. I have used it in my engine & transmission. I recommended it to a co-worker who has an Acura TL that was burning or losing a quart of oil every change. That stopped about half way through his first cycle.
I'm all for the stuff. So far I've used it in my Taurus and have noticed better throttle response in city and highway traffic and I'm consuming less oil than ever before. I think they're running a deal where the more you buy the more you save.