COLOR:

     Does not accurately predict oil condition

SMELL:

     Does not accurately predict oil condition

VISCOSITY:

     A significant increase could indicate oil failure
     Synthetic oil viscosity does not increase as much as petroleum oil viscosity
         as is oxidizes
     Diester and coolant oils viscosity do no tend to increase significantly with
         oxidation

TOTAL ACID NUMBER (TAN)

     Measures acid level in oil
     Best method of determining oil condition

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