Liqui moly 5153 pro line petrol system cleaner 500ml liqui moly 5153 p this pro line petrol system cleaner 500ml from liqui moly is suitable for all carburettor and fuel injection systems reducing co and hc emissions and optimising values before an exhaust emission check p p the fluid also solves cold start problems uneven idling poor throttle response performance losses lean surging and high pollutant values successfully tested in accordance with international standard cec test be