The present invention relates to a process for adjusting the gasoline / diesel ratio by converting an initial feedstock containing olefins having from 4 to 20 carbon atoms using a crystalline catalyst having reduced diffusion limitations. The process comprises: - treating a feedstock stream containing olefins comprising from 4 to 20 carbon atoms, with or without the presence of a stream containing aromatic compounds, - contacting said one or more catalysts with a catalyst under conditions effective to oligomerize at least a portion of the olefins and optionally alkylate at least a portion of the aromatic compounds, wherein the catalyst is a crystalline compound having a micro / mesoporous structure, selected from crystalline aluminosilicates, aluminophosphates crystalline silico-alumino-phosphates, crystalline zeolites, or the catalyst is a composite material comprising at least 20% by weight of at least one of the crystalline compounds mentioned above, and wherein the volume of mesopore the crystalline compound is at least 0.22 ml / g.
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