It's about four table spoons worth - I used a syringe with a little hose to put it into the sparkplug holes and the syringe happened to have cc markings on it. Like I said, it's not that critical, but too much is going to hydrostatically lock up the motor, so be careful. People with low compression motors don't have to worry, but B16 and B18c owners need to be careful. The longer you let the engine set after doing this, the better it will work. Perhaps overnight would be best. The car with the oil use problem needed to be treated overnight, so the stuff would go down into the ringlands of the pistons.