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Not really. You may have some change if you mix them but nothing you could really measure. The viscosity is a product of the base oil used and the additive package used by the manufacturer. While heavier oils tend to have a higher viscosity they also suspend more dirt and ash as they are being pumped through the system. Because of this they can cause the heat to fluctuate inside an engine and also affect fuel economy. For almost all applications on modern automobiles the oil you purchase across the counter is more than effective enough to provide engine or any other gear box protection.

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Q: Can oils of different viscosity's be mixed to get a different viscosity?
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