I'd only reconsider if i had a new car still under warranty as some of the newest diesels (CDI, TDI, etc) do not warranty fuel related problems when running biodiesel. VW recently announced it's warranties would cover up to 5% biodiesel (B5) blends. No warranty to worry about and I'd run Bio if available. It provide more lubricant, with less emmisions and money stays in our country. It's every bit as good a fuel as Petrol Diesel and then some.

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85 300CD
83 300TD
78 240D (daughter)