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Will engine oil mixed with gasoline ruin a car motor?

My son was low on gas one day and grabbed 2.5 gallon plastic container holding a mixture of gasoline and oil for the chain saw. Shortly there after the car began running harder and harder back firing etc. until it wouldn't run at all. Our mechanic said there was a leak in the block (I think) and we'd need a new motor.

Is it possible the Oil in the Gasoline mucked up the motor to a point it created a leak in the block?


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