* VISUALLY EXPLAINED

What does 5w30 & 10w30 mean? A simple, easy explanation of what engine oil codes mean, giving a sound understanding.

5W-30 and 10W-30 are both common engine oil viscosity grades that are used in various vehicles. They are part of a system of codes that helps users select the right oil for their engines. Here's a simple explanation of what these codes mean:

The "W" stands for "Winter": In engine oil codes, the "W" indicates the oil's winter viscosity, which is its flow characteristics in cold temperatures. It doesn't stand for "weight" as many people think. The lower the number before the "W," the better the oil flows in cold weather. So, both 5W-30 and 10W-30 are suitable for use in colder climates.

The First Number (5 or 10): This number represents the oil's viscosity at low temperatures. In the case of 5W-30, the "5" indicates that the oil has a lower viscosity and flows better in cold weather compared to 10W-30. This means it's thinner when cold, which is beneficial for easier engine startup in chilly conditions.

The Second Number (30): The second number, in this case, "30," represents the oil's viscosity at operating or high temperatures. It indicates how the oil performs when the engine is hot. A 30-weight oil is thicker and provides better lubrication at high temperatures compared to a 20-weight oil, for example.

In summary, 5W-30 and 10W-30 are both multi-viscosity engine oils that are suitable for use in a range of temperatures. The "5" or "10" indicates the oil's cold-weather performance, with "5" being thinner when cold than "10." The "30" represents the oil's viscosity at high temperatures. The choice between them depends on your specific vehicle and the climate in which you drive. Always consult your vehicle's owner's manual for the recommended oil viscosity for optimal engine performance.


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