Using an oil with the correct "W" rating for your climate ensures that the lubrication film forms immediately, protecting the engine from the destructive forces of cold-start friction. The second number in the viscosity grade indicates how well the oil resists this thinning.
5W-30 Oil Climate Suitability Guide
Modern Synthetics and the "W" Rating. The number preceding the "W" (for example, the "5" in 5W-20) represents the oil’s viscosity, or thickness, when tested in cold conditions.
If the oil is too viscous for the temperature—indicated by a high number before the "W"—the engine will struggle to turn over, leading to hard starts and increased wear. Engine components move differently depending on the ambient temperature.
5W-30 Oil Climate Suitability Guide
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. This balance is crucial for maintaining oil pressure and preventing the breakdown of the lubricant film, which can lead to premature engine failure.
More About What does the w stand for in oil
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