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Showing results for how is the flow of oil measured in an engine sae specification
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The Society of Automotive Engineers (SAE) measures engine oil flow using a viscometer device that measures how long it takes oil to flow at a specific temperature:
Cold temperature viscosity
The first number in an SAE oil rating, before the letter "W", indicates how the oil flows when it's cold, such as when the engine starts. The lower the number, the faster the oil flows.
Operating temperature viscosity
The second number in an SAE oil rating indicates how the oil flows at normal engine operating temperatures. The higher the number, the less the oil will thin out as it heats up.
Measurement temperature
The viscosity is typically measured at either 40°C (100°F) or 100°C (212°F). 100°C is often used for engine oils because it reduces interference from soot contamination.
Viscosity measurement
The elapsed time in seconds is converted to centistokes (cSt).
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A viscometer is used to determine the viscosity of engine oil. Higher viscosity numbers indicate thicker oils because they take longer to flow through the viscometer when tested.
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SAE Viscosity Grades for Engine Oils - FS System
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The number before the "W" defines the flow behaviour of oil at low temperatures. The smaller the number, the more liquid the oil remains at low temperatures.
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