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How do you make 10w30 out of 15w40 motor oil?

It is not possible to make 10w30 motor oil out of 15w40 motor oil. The numbers in the oil designation refer to the oil's viscosity, or thickness. 10w30 oil is thinner than 15w40 oil, so adding something to 15w40 oil to make it thinner is not possible.
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