3,500 GAL PER MONTH, COLORADO. FOR SALE - YELLOW GREASE QUALITY UCO Submitted by an Anonymous Greaser on Sat, 2011-01-22 20:08 we collect up to 4K gal. UCO per month in colorado. screen filtered, <1% water, believe to be yellow grease quality. Looking for the best price! please contact FernGreasy@gmail.com Reply to this post Your name Comment * Location * What code is in the image? * Enter the characters shown in the image.