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The reason that oil and water do not mix is mostly due to their charges. Water is a polar molecule. This means that both ends of a water molecule have positive and negative charges. As you've probably seen before, opposites attract. This makes water molecules "sticky" so they'd rather cohere to one another than stick to another substance, as magnets "stick" to each other. Oil molecules, however, are different. They do not repel the water molecules, as it is believed. In fact, they are quite attracted to water molecules. But because the water molecules are far too attracted to one another, the oil molecules are pushed away, producing the rejecting combo. It is commonly believed that the only reason they do not mix is because oil is less dense. This is true, but it is not the reason they do not mix. It is only the reason that the oil ends up on the top; above the water.

For more info, check this out.
http://www.chemistry.org/portal/a/c/s/1/feature_tea.html?id=c373e90aff20ad2e8f6a17245d830100

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water and oil dont mix beauce oil is ligher than water beacuse water has irrorn and oil does not