5W-20: Offers excellent fuel economy and cold-weather protection, commonly found in newer domestic and foreign vehicles. This system quantifies how thick or thin the oil is and how it responds to temperature changes.
SAE Oil Grade Comparison Chart: Matching Viscosity to Your Engine
This measurement ensures the oil maintains sufficient thickness to prevent metal-to-metal contact when the engine is under full thermal load. Adhering to these specifications ensures that the oil pump delivers adequate pressure, the hydraulic lash adjusters function correctly, and the variable valve timing mechanisms operate as intended.
On the other hand, using a viscosity that is too high can cause poor cold starts, reduced horsepower, and decreased fuel efficiency due to internal drag. Utilizing a viscosity that is too low can lead to increased oil consumption, bearing wear, and sludge formation.
SAE Oil Grade Comparison Chart: Matching Viscosity to Your Engine
Decoding the Numbers for Engine Protection The numbers preceding the "W" describe the oil's viscosity at 0°F (-18°C). These older formulations were common in vintage vehicles but are largely obsolete in modern applications where temperature fluctuations are extreme.
More About Sae in oil meaning
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