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Left to its own devices, no - each is already a complex mixture of compounds that all dissolve in one another. The hydrocarbons in diesel are chemically quite similar to those in petrol - it's just that the chains are about twice the size. This means that petrol and diesel will quite happily dissolve in each other.

Given a few million pounds' worth of oil refinery, separating the two becomes an everyday task.

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15y ago

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Does petrol and diesel mix. Or do they separate if left. ie diesel sits at the bottom and petrol floats on top?

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