Don't do it, heard it's not recomended on high mileage cars because you might loose compression
I've done it before, not a big difference. It just cleans the motor from the carbon build up just divide it 3 ways a part in the gas tank a part through a vacuum line usually the brake booster, and the last in ur oil right before an oil change, u put it in and just let it idle for 5 min, don't drive it or rev it cuz it brakes down the oil. After u let it idle then just a regular oil change
do it u pussy and pour the whole bottle in