A 30-weight oil is thinner than a 40-weight oil at operating temperature. This number is measured by testing the oil's flow at extremely cold conditions, typically at 0°F (-18°C).
Oil Weight Explained First Time Buyer Guide
The numbers on a bottle of motor oil, such as 5W-30 or 10W-40, are not arbitrary; they are a precise language describing the oil's physical behavior under different temperatures. The High-Temperature Rating: Stability Under Pressure The number following the "W" represents the oil's viscosity at the normal operating temperature of an engine, usually measured at 212°F (100°C).
A lower number before the "W" signifies that the oil remains fluid and pumpable when it is bitterly cold. Think of water, which pours easily and has low viscosity, compared to honey, which is thick and moves slowly with high viscosity.
Oil Weight Explained First Time Buyer Guide
Choosing the right oil weight is one of the most important decisions you will make for your vehicle's longevity and performance. Modern Blends and the Rise of Synthetic Oils.
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