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Is it safe to add diesel fuel to motor oil in a car?

Updated: 8/21/2019
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8y ago

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For use as an engine lubricant - no.

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8y ago
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8y ago

Not a good idea and why would you?

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Q: Is it safe to add diesel fuel to motor oil in a car?
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Short of re-refining it there is no good way to break the long molecules of motor oil into the size that makes diesel fuel. You can add small amounts of motor oil to diesel fuel and it will burn but it is not recommended.


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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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