The Liqui-Moly Diesel Combo Pack is comprised of the Pro-Line Diesel Intake Cleaner an Speed Tech Diesel Additive. The system cleaner is a high-tech additive solution that removes stubborn dirt and other residue within the intake and throttle valve area. The removal of such residue enhances performance as well as reducing fuel consumption. The Speed Tech Diesel Additive was developed to increase acceleration under partial load whilst providing a better driving experience. The additive has been tested safe for all diesel vehicles with catalytic converters and turbochargers.