I love it, the only thing is you need to be careful as to how you use it, it is very potent stuff. I personally would stay away from putting it in the oil because it will thin out the oil, but if your using it to "Flush the motor" that will be fine, dont run it long. Running the motor for 5 minutes with it in is one thing, putting 500 miles on it is another story. Putting it down the brake booster to clean in the intake works well although it can really mess up your o2 sensors. If you put it in the tank it works best, it will clean your entire fuel system plus the intake valves, ports and combustion chambers, where the cleaning it will make the difference.