dispersed ammonium chloride does not increase and clearly the ratio worsens sharply this surprisingly demonstrates that a large quantity of additive according to the present invention is not necessary to obtain excellent efficiency results the comparison of the parallel results 50 and 100 ppm of table 3 with those of table 2 shows that the coefficient of efficiency of duomeen c is better by a factor of about four than that of the competitor table 3 series of tests in lco light cycle diesel oil after one hour of rest the above tests were repeated using lco as the dispersion fluid and the comparable results are shown in the tables that follow the results shown demonstrate the superior efficiency of duomeen c as a dispersant according to the present invention with respect to the two comparison dispersant particularly in relation to the use of lower dosages of the dispersant in a fluid that mimes different process conditions from those of example 1 series of tests in lco one hour of rest with granular ammonium chloride the experiment with 800 ppm of duomeen c was duplicated using ammonium chloride in granular form instead of finely pulverised as in the previous experiments with the results shown in table 7 below although conductivity and hence the quantity of dispersed salt is lower than that obtained with the fine powder table 5 of example 2 there is still significant dispersion this is.