The Petroleum Quality Institute of America (PQIA) is an independent resource for information and insights on the quality and performance of lubricants in the marketplace. Our mission is to serve the consumer of lubricants by reporting on the quality and integrity of lubricants in the marketplace.
D5800 - 08 Standard Test Method for Evaporation
Loss of Lubricating Oils by the NOACK Method
determines the evaporative loss of engine oils.
This test is important because the operating
temperatures of an engine will typically drive
off the lighter ends of a lubricant while in
service. This effectively results in pushing the
viscosity of the lubricant to a more viscous
level (up) and, as a result, fuel economy
goes down due to an increase in parasitic load.
The evaporation loss is of particular
importance in engine lubrication. Where high
temperatures occur, portions of an oil can
evaporate. Evaporation may contribute to oil
consumption in an engine and can lead to a
change in the properties of an oil.