Just bought a 1980 300Sd that had been parked for three years. The fuel was dark brown from the critters living in it. I drained about nine gallons into two five gallon Nalgene jugs with the intention of dumping it. I pulled and cleaned both tanks, cleaned the screen, replaced the rubber fuel lines, and blew out the feed and return lines. I put in about ten gallons of fresh fuel with new filters and a shot of Biobor and that made the car happy again. Just for fun I gave one of the jugs a shot of Biobor too. In two days the treated jug was clear enough to see the bottom so I treated the other one. A week later I ran it through a 5 micron filter to get rid of the goo and used it in my daily driver.

Most impressive thing I've seen with Biobor is the treatment of 8,000 gallons of continated fuel in a boat. They shocked the tanks with Biobor and two days later came back and pumped the fuel into their holding tank while they flushed the tanks with 15 gallons of kerosine. They saved his fuel, cleaned his system, charged him $500 and gave him a one year warranty.