Other brands use deposit control additives in their gasoline that do an adequate job in the engine’s intake system, but many of these additives contribute to combustion chamber deposits. Excessive combustion chamber deposits can cause an engine to need a higher octane gasoline to avoid knock and run-on, or loss in performance. These excessive deposits can also cause higher emissions of nitrogen oxides. In contrast, Chevron’s exclusive deposit control additive, Techron, provides unsurpassed intake system deposit control and minimizes contribution to harmful combustion chamber deposits.