So would I... that's bs. And no, you definitely shouldn't need to seafoam the car already, you shouldn't have to for a long long time. That's not something that should be done regularly, I've seen it eat away at engines from people using it too much. I just put it in my fathers truck at 499k for the first time, and it barely effected the way the truck runs, just raised the mpg from 4.2 up to 4.9 mpg and gave it a little more power, but didn't help with the rough idle at all. Only use it if the car isn't running right and it's an issue the seafoam should fix, other than that I'd avoid it as long as possible.