This makes 10W-40 thicker at high temperatures than a 10W-30, making it suitable for engines that run hotter or carry heavy loads. The specific number you are focusing on, particularly the second one in the sequence, is a critical indicator of the oil’s high-temperature performance.
Understanding What a Higher Grade Number Means for Oil Viscosity
A higher grade number means the oil is formulated to resist this thinning process, known as shearing, thereby maintaining a consistent and effective protective layer even when the engine is working hard. A higher grade number for oil means it is thicker and flows less easily at a given temperature.
As engines age, internal components like bearings and seals can wear down, leading to larger gaps and increased oil consumption. When an engine runs, it generates significant heat.
A Higher Grade Number Means Thicker, More Heat-Resistant Oil
If the oil is too thin, it will lose its lubricating properties, leading to increased friction, wear, and potential engine damage. Manufacturer Specifications and Modern Engines It is vital to consult your vehicle’s owner manual before making a decision about oil viscosity.
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