| abstract |
Method for reducing intake valve deposits in a spark ignition internal combustion engine which is fuelled with a gasoline fuel composition, wherein the method comprises introducing into the engine an aqueous based composition, wherein the aqueous based composition comprises (i) water, (ii) from 0 vol% to 40 vol% freezing point suppression agent, (iii) from 0 vol% to 10 vol% of surfactant, and (iv) an amine compound in a blending amount of from 0 ppmw to 1000 ppmw. |