Higher numbers such as 30, 40, or 50 indicate a thicker oil that maintains its structure and oil film strength when the engine is hot. When you glance at a bottle of motor oil, the label likely features a code such as 5W-30 or 10W-40.
Understanding SAE Oil Ratings for Optimal Engine Protection
Drivers in regions with harsh winters might prioritize a low first number (such as 0W or 5W), while those in consistently hot climates might focus on the second number to ensure high-temperature protection. This versatility makes multi-grade oils the standard choice for contemporary vehicles.
Viscosity, in simple terms, is a fluid's resistance to flow or its thickness. Multi-Grade Oils Historically, drivers used single-grade oils that were suitable only for specific temperature ranges.
Choosing the Right SAE Oil for Your Car's Engine and Climate
The Science Behind the Grades The specific numbers assigned by the SAE are not arbitrary; they are based on precise kinematic viscosity measurements. For example, an SAE 30 oil performed well in warm weather but became dangerously thick in winter.
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