Every engine is designed to operate optimally with a particular viscosity range. A higher number indicates a higher resistance to flow, meaning the oil is thicker.
Higher Grade Oil Thicker Cold Start
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. In some high-performance or turbocharged engines, a higher grade number is specifically required to handle the increased pressures and temperatures generated by these advanced technologies.
This makes 10W-40 thicker at high temperatures than a 10W-30, making it suitable for engines that run hotter or carry heavy loads. Automobile manufacturers rigorously test engines to determine the exact specifications that provide optimal protection, fuel economy, and performance.
Higher Grade Oil Thicker Cold Start
Imagine comparing water to honey; water flows readily while honey is slow and thick. 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.
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