This is why you will often see ratings like 10W-40 or 5W-30, where the second number represents the oil’s viscosity at the engine’s normal operating temperature. Modern Synthetics and the "W" Rating.
What the W in 5W-30 Oil Means for Viscosity and Engine Performance
Choosing the Right Grade for Your Vehicle Selecting the incorrect oil viscosity can have serious consequences for your engine. Deviating from these recommendations by choosing an oil with an unsuitable "W" rating can void warranties, reduce fuel economy, and compromise the durability of vital engine components.
The second number in the viscosity grade indicates how well the oil resists this thinning. This balance is crucial for maintaining oil pressure and preventing the breakdown of the lubricant film, which can lead to premature engine failure.
What the Second Number in 5W-30 Oil Viscosity Means at Operating Temperature
A higher number signifies a thicker, more durable oil film at high temperatures. Engine components move differently depending on the ambient temperature.
More About What does the w stand for in oil
Looking at What does the w stand for in oil from another angle can help expand the discussion and give readers a second clear paragraph under the same section.
More perspective on What does the w stand for in oil can make the topic easier to follow by connecting earlier points with a few simple takeaways.
