Aromatic content in gasoline fuels should be limited due to its influencies to the cleanessof engine combustion chamber and emission of carbon monoxide, carbon dioxide andhidrocarbon. Ussually the highest aromatic content mean more higher its benzene contentand it will couse increase of air pullotion. According to specification of gasoline 91 (SKNo. 3674 k/24/DJM/2006), maximum aromatic content is 50 % volume. Those specificationconform to catagory 1 of World Wide Fuel Charter (WWFC). However, aromatic and ben-:ene content test on domestic gasoline in Indonesia obviously fulfil maximum limit for gaso-line catagory 2 of WWCF. Effect of several volume variaties of aromatic content in gaso-line 91 againts deposit development and cleaness (rating) of engine combution chamber■will be discuss in this paper.
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