ASTM D3380

ASTM D3380 is a standardized test method used to measure how easily motor oils and other lubricants flow at low temperatures. It assesses the oil's cold-start performance by determining the viscosity (thickness) of the oil after cooling it to a specific low temperature. This helps predict how well the oil will perform in cold weather, ensuring proper lubrication and engine protection during startup. The test results inform manufacturers and consumers about the oil's suitability for use in cold environments, contributing to engine reliability and longevity.