STP Super Concentrated Fuel Injector Cleaner is a do-it-yourself fuel injector cleaner that contains concentrated detergents. What this product does is dissolve and remove harmful carbon, gum, and varnish deposits on fuel injectors. If you don’t want to deal with problems such as rough idling, hard starts, and lost acceleration then this concentrated fuel injector cleaner is a must-have. High-quality fuel injector cleaner stands out among other products of its kind thanks to jet fuel, a high-quality carrier of active ingredients. Ideally, you should use this product with every oil change or 4000 miles. Safe for any gasoline changes, this item is crucial for the proper functioning of your vehicle. This 12-pack is a lifesaver.