follow the same steps as the scanenge sysyem.. but you dont remove the oil filter till your finished.. add a qt of oil to the tank after you drain it.... if the return line stops pumping oil stop the engine then... I never have to run the whole qt through... to get clean oil out of the return line...your just flushing out all the dirty oil & replacing it with clean oil.... its really simple.. then remove the oil filter & install a new oil filter & continue like normal.. now if you havent done this it may take more that 1 qt to flush your system.......depends on how dirty it is..you can buy the oil scavenger or save some $$ & do it this way..eather works fine..nuttin wrong with the scavenger...