No engine manufacturer will honor warranty claims due to bad fuel. All engine manufacturers warranty for parts and workmanship, if you use a fuel that is incompatible with the parts (natural rubber) or of bad quality (old biodiesel has gums that will damage fuel injection equipment) it is your fault and responsibility. If your stereo goes out, it isn't the biodiesel.

Prices in Europe: I believe biodiesel is typically less expensive than Dino-diesel in Germany.

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83 300SD
81 300D
79 300SD
All Running on Biodiesel!