Assuming from what you quoted, you are still asking about oil, if we assume a density of 0.88 kg/L, then 66000 kg or 66 t.
However, the answer varies with density. Typical vegetable oils are around 0.92 kg/L, so 75000 L would be 69 t. Gasoline is much lighter than oil, around 0.73 kg/L so 75000 L of gasoline would be 54.8 t. Each of these products have lot specific densities that vary a little around the nominal, so use a measured density for the specific lot in question.
want to know the density for gasoil,gasoline and diesel
Density can vary lot to lot as petroleum products are mixtures of many different chemicals. Figures below are typical and can vary:
Motor gasoline: 0.73 kg/L (Av gas is lighter)
Automotive diesel: 0.84 kg/L. Heavy diesel used in ships can go up to 0.95 kg/L or higher.
Gasoil seems to be about the same as automotive diesel. Jet fuel (and winter or #1 diesel) are around 0.8 kg/L.
If you need any great accuracy, use measured density for the lot in question. Also, all the densities vary with temperature due to thermal expansion.