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Noack volatility test

Noack test

The Noack test is an ASTM D5800 test to determine the amount of evaporation loss of certain lubricants in a motor oil

Noack test procedure

A pre-determined weight of motor oil is heated tot 250 °C for 60 minutes. A constant flow of air is passed over the hot oil. The lighter fractions evaporate in the air stream and at the end of the test the remaining oil is weighed to determine the amount lost. .

As the lighter hydrocarbon fractions evaporate, the viscosity of the remaining oil increases, contributing to poor circulation, reduced fuel economy, increased oil consumption, wear and tail-pipe emissions.


Posted on by Rick Muscoplat


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