Injuneer, wasn't saying that you said that, just sounded like you were against it. I used it a while back and had great results. I noticed my idle was smoother as well as slight throttle response. I warmed the car up, shut it off, and put 1/2 a bottle in the brake booster like it said and then shut off, let it sit for 15-20 mins and ran it hard. I pulled 2 spark plugs a few days later after hearing some of this contreversy. They looked completely normal to me, and the correct color/condition.

I think i will be a little hesitant to use it again do to its potential to cause problems though.