Is it ok to use "bio-diesel," #5 in my...

It would be best to get clarification from MB as to what they say can be used. My motor home has a 2006 Cummins in it and the factory says the 5% biodiesel is the max that should be used in it. Fortunately, the 2006 engines do not need ULSD, but LSD is becoming a thing of the past anyway (at truck stops that is).

 

It's a 95 car, so I am assuming you won't be facing any warranty issues by using biodiesel of any grade. I used 100% Biodiesel in my 97 Dodge Ram and the only thing you might face is that biodiesel has a higher detergent effect than standard diesel, so if you start using bio, make sure you change your fuel filters after the first 1000 miles or so. Also, biodiesel might eat up softer fuel lines...but I don't think this would be a problem in a 95. I could be wrong about that.

 

my neighbor ran his last summer on straight vegetable oil poured right in the tank. i plan on this being my next project.

 

Consult the national biodiesel board web site and follow their recommendations, http://www.biodiesel.org/. They want their product to succeed and will not steer you to risk-taking. Probably 20% should be your max biodiesel content. Most important is to buy biodiesel from reliable source. Much of the stuff for sale does not meet specs. Could contain methanol (very corrosive) and other contaminants as well as un-reacted raw veggie oil.

Do not use un-processed veggie oil or waste cooking oil. Will ruin engines in time. Biodiesel is a chemically-transformed veggie oil, not the raw stuff.