TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: In the method (M1), the adding occurs in at least one evaporator located upstream from the centrifuging. The fermentation process comprises a series of evaporators that the stillage enters sequentially and located upstream for the centrifuging, and where the adding of the separation aid occurs just prior to or in at least one of the evaporators located closer to the centrifuge. The series of evaporators comprise at least 8 evaporators and the adding occurs just prior to or in the 5 th, 6 th, 7 th or 8 th evaporator. The surfactant is present. The lecithin and the oil are present in a lecithin:oil weight ratio of 0.8:1 to 1:0.8. The separation aid is added in an amount to be present in a ppm of 200-800 ppm. The separation aid is added to the stillage utilizing a side stream; is added directly into the evaporator containing the stillage; is mixed with the stillage prior to entering the evaporator; and further comprises silica. The stillage has a solids content of 5-20 wt.% when the separation aid is added to the stillage; has a solids content below 30 wt.% when the separation aid is added to the stillage; is a by product from a corn fermentation process; and is a by product from a sugar cane fermentation process. Preferred Stillage: In the treated stillage (S1), the solids content of the treated stillage is 5-40 wt.%. Preferred Components: The separation aid comprises 30-70 wt.% of lecithin; 30-70 wt.% oil; 0-40 wt.% surfactant; comprises less than 1 wt.% water; comprises less than 1 wt.% aromatic compounds; comprises less than 1 wt.% alcohol compounds; and is a food-grade or GRAS approved composition or mixture. The oil is mineral oil, and/or vegetable oil; and is triglyceride oil or hydrocarbon based oil. The lecithin is an acetylated lecithin; and is soy lecithin or soy bean lecithin. The surfactant is ethoxylated castor oil or polyethylene glycol (PEG) surfactant; is a non-ionic surfactant; is a cationic or anionic surfactant; has a HLB value of 9-20; is at least one sulfonate; and is at least one acetylenic glycol. EXAMPLE - No suitable example given.