This number reflects the oil's ability to maintain a stable, protective film under stress. A typical multigrade oil, such as 5W-30, combines two numbers separated by a "W" which stands for winter.
How SAE Ratings Keep Your Engine Protected at Every Temperature
Reference Guide for Common Ratings SAE Grade Cold Temp Performance Hot Temp Performance 0W-20 Excellent flow in extreme cold Moderate protection at high temps 5W-30 Good flow for easy starting Balanced protection for daily driving 10W-40 Standard flow High protection for towing or hot climates 15W-50 Thicker flow when cold Heavy-duty protection for high stress Viscosity vs. The Cold Temperature Factor At startup, an engine experiences significant friction because the oil is pooled in the oil pan.
Decoding the SAE Viscosity Rating The primary purpose of the SAE rating is to communicate the oil's behavior at two key temperature extremes: cold startup and hot running conditions. These polymers, known as viscosity index improvers, expand in heat to thicken the oil and contract in the cold to keep it flowing.
How SAE Ratings Keep Your Engine Protected at Every Temperature
Choosing the Correct Specification Selecting the wrong SAE grade can compromise engine performance and longevity. This numerical code ensures that an oil film remains effective across a wide range of temperatures, protecting critical engine components from friction and wear.
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