Modern Synthetics and the "W" Rating. Choosing the Right Grade for Your Vehicle Selecting the incorrect oil viscosity can have serious consequences for your engine.
Choosing the Right 5W-30 Oil for Your Vehicle
Conversely, in the heat of summer, the oil must maintain a stable, viscous film to prevent metal-to-metal contact. The "W" rating system addresses this challenge by providing two distinct performance metrics: one for cold cranking and one for high-temperature stability.
This rapid circulation is vital because the majority of engine wear occurs during the initial moments of operation when the metal parts are not yet lubricated. The second number in the viscosity grade indicates how well the oil resists this thinning.
Understanding the 'W' Rating for Optimal 5W-30 Selection
Cold Weather Protection During winter, engines face the challenge of thickened oil and reduced battery efficiency. When you pour your car’s engine oil into a measuring cup, the label likely reads something like "5W-30" or "10W-40.
More About What does the w stand for in oil
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