DIESEL TREATMENT. Carbon build up in the combustion chamber and on the intake valves, plus deposit build up in the fuel injectors and carburetors restricts fuel flow, causes poor runability and reduces fuel mileage. These same deposits increase emissions of carbon monoxide (Co), unburned hydrobarbons (Hc) and oxides of nitrogen (Nox). Nox is the brown killer haze we can see. Now there is an effective solution to the problem with TRI-CLEM AM-4020.