A typical multigrade oil, such as 5W-30, combines two numbers separated by a "W" which stands for winter. These polymers, known as viscosity index improvers, expand in heat to thicken the oil and contract in the cold to keep it flowing.
Understanding SAE Oil Ratings in Cold Weather
The Cold Temperature Factor At startup, an engine experiences significant friction because the oil is pooled in the oil pan. A 30-weight oil, for example, is designed to be thick enough to sustain a strong oil film that prevents metal-to-metal contact while the engine is under load.
Conversely, using oil that is too thick in cold weather can result in difficult cold starts and reduced fuel efficiency due to the high resistance the engine must overcome. The Society of Automotive Engineers (SAE) established a standardized system for grading the viscosity, or thickness, of lubricants.
Understanding SAE Oil Ratings in Cold Weather
The lower this number, the thinner the oil and the quicker it circulates, reducing wear on dry engine surfaces. Balancing Act: Multi-Grade Technology Modern multi-grade oils utilize advanced polymer technology to achieve a balance between cold flow and high-temperature stability.
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