Deposits on carburetors, fuel injectors, intake valves and combustion chambers can cause your car to produce higher emissions, which contribute to air pollution. Chevron Supreme with Techron is unbeatable at cleaning up the intake systems and avoiding these deposits, giving you reduced emissions compared to lower quality premium gasolines. And unlike the deposit control additives used by many other brands, Chevron's exclusive nitrogen enhanced Techron additive contains polyether amine (PEA) chemistry, which cleans up intake system deposits while minimizing any contribution to harmful combustion chamber deposits that may increase emissions or lead to deposit-related engine knock.