A higher grade number for oil means it is thicker and flows less easily at a given temperature. Choosing the Right Grade for Your Engine Selecting the correct oil grade is not a matter of choosing the highest number available, but rather matching the oil to your vehicle’s specific engineering requirements.
How Oil Thickness Affects Engine Performance and Longevity
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. In many cases, mechanics might recommend a higher grade number for oil in older vehicles.
Conversely, oil that is too thin will fail to protect the engine under stress. Using oil that is too thick for your engine can lead to poor fuel economy and reduced efficiency, as the engine must work harder to pump the lubricant.
How Oil Thickness Affects Engine Performance and Longevity
Imagine comparing water to honey; water flows readily while honey is slow and thick. This makes 10W-40 thicker at high temperatures than a 10W-30, making it suitable for engines that run hotter or carry heavy loads.
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