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I would recommend draining the entire fuel system and re-filling it with pure diesel. I do know some guys that add a gallon or two of gasoline to their diesel trucks, meaning big rig semi's, in the winter for easier starting, however their truck's fuel tanks have a 50 gallon capacity. Diesel is a lubricant as well as a fuel. Running gasoline, or a high mixture of gasoline WILL cause SERIOUS damage to a diesel engine. So my advice would be to get it out.

To add a different perspective, the Mercedes manual for the older Mercedes cars says you can safely run up to 30% regular gasoline mixed in your diesel fuel - mostly for winter, as stated above. Most diesels would be safe at near this level of mix. But at the ratios mentioned in the question looks like only a 15% mix. This should be safe, especially as a one time deal. As you run some out, just add more diesel when you can. Much better than wasting the 46 liters of fuel! Don't panic. Add a couple ounces of 2 stroke oil if it makes you feel better.

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Q: Will having seven liters of petrol in my diesel 2002 Mondeo ruin the engine even though I have diluted it with 46 liters of diesel fuel?
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