Oil Viscosity Grade Numbers (e.g., the 10W and 30 in 10W-30 oil) represent the oil’s viscosity range and limits, not its actual viscosity. Since viscosity varies with temperature, the temperature must be specified for accurate readings. For example, a 30 grade oil has a kinematic viscosity of about 10 cSt at 100°C, ideal for most
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The SAE J300 Engine Oil Viscosity Classification provides a standardized way to categorize oils based on their viscosity at different temperatures, helping consumers and manufacturers choose the right oil for specific applications and climates. In 1911, the Society of Automotive Engineers (SAE) introduced the SAE J300 Engine Oil Viscosity Classification, a numerical code system designed