Techron protection plus powersports & Small Engine fuel system treatment is formulated for the most severe operating environments. Techron improves engine operability issues such as rough idle and Accelerator/throttle responsiveness. Minimizes cold-start problems and deposit-related knock and ping. Reduces harmful exhaust emissions. Will not harm catalytic converters and Oxygen sensors. Recommended for use in: All gasoline engines including two-stroke, four-stroke, carbureted, port- or electronic-fuel-injected and direct-injected engines. not for aviation. engines burning E0 or Ethanol-blended fuel such as E10, E15 and E85.