I have a 1981 300D with 287k miles. It has a custom fuel heater sufficient for running straight veggie oil. I have run 6 full tanks of SVO and my Benz ran amazing with no clogged filters or any performance loss. My supplier did not have veggie when I came to fill up and filled me up with one full tank of biodiesel. After 280 miles on it I added 1 gallon of diesel and 5 gallons of veggie oil. The motor runs great but now my prefilter becomes clogged constantly with sediment from 32 years of dino diesel use. Just the one tank of biodiesel has created so much sediment from cleaning my fuel system, that the veggie can not even reach the prefilter due to large chunks in the fuel line. Is there any advice you can give me to make my car return to normal besides dropping and cleaning the tank?