Friday, July 23, 2010

Pure/used oil viscosity difference?

What are the reasons that can make the viscosity of pure oil and used oil so different? (I need 4)Pure/used oil viscosity difference?
Oil in a cars engine gets diluted with gasoline (and other substances) that make it thinner with time. The oil does not wear out it collects other substances that can only be eliminated by changing the oil.
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