zMAX Multi-Purpose Formula Treatment for Engine, Fuel & Transmission- Reduces Carbon Build-Up - Lubricates Metal - Improves Gas/Diesel Performance EXTEND THE LIFE OF YOUR VEHICLE: zMAX Multi-Purpose Formula is simple and easy to use. Micro-lubrication soaks into metal surfaces which improves lubricity and reduces carbon deposit build-up while boosting performance and protecting vital vehicle parts. ENGINE EFFICIENCY: Use the All Purpose Formula to help to restore the combustion valve and piston ring sealing resulting in a smoother running motor and more power. Reduces engine wear and lowers emissions which improves fuel efficiency and performance. FUEL & TRANSMISSION CONDITIONER: Cleans varnish in valve bodies for smoother shifting, lubricates the injector system and conditions pumps and nozzles while reducing carbon residue from valves and pistons. Perfect for manual or automatic transmissions! TRUSTED QUALITY AND PERFORMANCE: zMAX is proud to be the Official Micro-lubricant of Speedway Motorsports. Trusted for over 80 years, the USA made All Purpose formula saves money at the pump and extends the engine life of all your vehicles.