This morning I passed my local International dealer and saw a sign for bio-diesel, so I figured my car is almost empty and I would try it. I went inside and inquired about it and they gave me a very interesting brochure about it. After speaking with the owner of the dealership he told me that the biodiesel that he sells is 5% soy-95% diesel. There are supposedly no adverse affects with that combination except that it acts as a solvent and has a very strong algicide effect which may loosen any algae and send it up to the filters. After only 50 miles I do have to say that the car does run better, perhaps the fuel did "clean house". Anyone else ever use biodiesel?? Just in case you are wondering 50 Cetane disel here is $1.30 a gallon and biodiesel was $1.20 a gallon.
Let me know your thoughts.

Actually C.J., what you bought is what is referred to as "soy-diesel" if I got the description correct. They are selling it like that around here too. In my area it is only the premium diesel that is "soy-diesel". Like you said all they are doing is adding soybean oil to petroleum diesel fuel. I works great in concentrations under 25%. It will smoke less, make "smoother" power, and lubricate the upper end of your engine better as well as the injector pump seals. You are also correct in the fact that it may be time to get a couple of spare filters unless you already have some on hand! I have run some of this stuff in my 300D too. Only when I don't have time to actually make bio-diesel. ( my press routes consume around 40 gallons per week in the Mercedes) What I'm doing is making "bio-diesel" from used restaurant grease. I have been doing this for almost 3 years now. I 've run it in VW's and Mercedes quite a bit, even in my Ford with the Navistar diesel. They all like the stuff, and it smells better too! I'm rather addicted to diesel soot and I like to get a good dose up my nose every once in a while, but I like the smell of the BBQ grill that comes out of my exhaust pipe much better. The only bad part of running homebrew is that you should be prepared to put on a few pounds yourself, because after smelling that stuff all day (windows down) when I get home I'm STARVED. I don't want a salad either, not after smelling (what smells like) a BBQ grill following me around all day. I don't know if there is anyone else on this forum running biodiesel or not. I know there are a few on Fred's TDI group and my VW diesel group that are. My brother is on one of those so I KNOW that there is at least one ! If I haven't clarified well enough as to the difference between soy-diesel and biodiesel look here maybe that will help. Tom www.veggievan.org