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Most previous laboratory-scale deposit simulator studies have considered mainly fuel or lubricant composition and properties, with no consideration of possible effects of NO,, which may affect initiation of the deposit formation process and the overall rate at which deposition occurs. In this study a laboratory-scale deposit simulator was developed which produced thin deposit films by spraying gasoline on to a heated aluminium sleeve to investigate the effects of temperature, N O , and possible gasoline blending components, on deposit formation. The amount of deposit collected is indicative of the deposit-jorming tendency of the test fuel. The deposit film composition was analysed using Fourier transform infrared (FTIR) spectroscopy. The results of the experiments indicate that deposit formation is indeed sensitive to NO,, in addition to the efects of temperalure and the molecular structure of the hydrocarbons. Thus the effect of NO, in deposit-related studies is important and should not be ignored.The F T I R analyses showed that when using NO, the deposits are of a uery similar structure to those produced in a real engine test.The analyses also gave some insight into the role of N O , in the deposit formation mechanism.