Clean fuel injectors are key in maintaining peak engine performance. Clean fuel injectors provide more efficient combustion of fuel resulting in more power, less emissions and improved fuel economy. A test called the Cummins L10 Injector Cleanliness Test is the standard in the industry for evaluating fuel additive effectiveness on injector cleanliness. Power Service manufactures additives that pass the Cummins L10 test to keep fuel injectors clean, and additives that exceed the requirements of the test by actually cleaning dirty fuel injectors.