Lubricants (oils) are made from standard base-stocks of given viscosity. This applies to both natural mineral oils and synthetic (POA) oils, (not chemicals)  These base stocks are then blended to get to the required viscosity.  Normally a thinner oil is added to a thicker oil to get a lower viscosity than the thicker oil. All oils have a range of molecules and the lesser/greater sizes are referred to as light ends or heavy ends. To 'evaporate' an oil would require temps well in excess of no
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