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Gas in the oil is also not a source of pollution, as it's sent into the intake by the PCV system, to be burned.
However, it's a terrible lubricant, and if you only use the car to go to a mile to chruch on Sundays and the store on Monday, gasoline and H2O in the oil can become a problem because the oil in the pan doesn't stay hot enough to allow gas and water to evaporate.
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