Ive had my best flushes when using a cup or more of oil.Im wondering if the gallbladder releases more bile for a longer period of time depending how much oil it detects.My last 2 flushes ive gone back to a 1/2 cup oil and only eliminated rice size and smaller stones.Even though i did get out 100 to 200 stones out on these two flushes it wasnt even close to the 1 cup of oil and up flushes.I got out more stones with the 2 large oil flushes then i did with about 5 1/2 cup of oil flushes.