Patent ID: 6652667
Filing Date: 2003-11-25
Classification: C10L,F02B

Abstract:
A method for removing engine deposits in a gasoline internal combustion engine which comprises introducing a cleaning composition into an air-intake manifold of a warmed-up and idling gasoline internal combustion engine and running the engine while the cleaning composition is being introduced, said cleaning composition comprising:(a) a phenoxy mono- or poly(oxyalkylene) alcohol having the formula: wherein R and R1 are independently hydrogen or methyl and each R is independently selected in each â€”CH2â€”CHRâ€”Oâ€” unit; and x is an integer from 0 to 4; or mixtures thereof; (b) at least one solvent selected from: (1) an alkoxy mono- or poly(oxyalkylene) alcohol having the formula: wherein R2 is alkyl of 1 to about 10 carbon atoms; R3 and R4 are independently hydrogen or methyl and each R3 is independently selected in each â€”CH2â€”CHR3â€”Oâ€” unit; and y is an integer from 0 to 4; or mixtures thereof; and (2) an aliphatic or aromatic organic solvent; and (c) at least one nitrogen-containing detergent additive.