Quote:
Originally Posted by DaveinGermany
Bio-fuel, is what you're talking about here. Quite some years ago the Germans decided to reduce reliance on pure diesel & started producing Bio-diesel & mixing it with traditional diesel at about 7%, there was uproar & no one would touch it, even the ADAC (RAC equivalent) condemned it as it would cause numerous problems with older vehicles the main one gumming up injectors & damaging engines.......
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I've used bio diesel as well from a local producer but I ran a Xantia of almost pure veg oil with a little diesel to thin it down a bit. The problem is the viscosity at lower temperatures so it was a summer experiment only. You can run straight veg oil all the time but you need to heat it to thin it which is a faff and I didn't want to take it that for by adding heat exchangers etc.
One problem with bio in older cars is that it can cause problems with seal used, newer diesels use different materials not affected by the bio diesel.
Some bio diesel isn't as green as people think, most is a methyl ester made using methanol which comes from the petrochemical industry. An ethyl ester made from ethanol is greener as long as you make your ethanol by fermentation and not petrochem