Quick Answer: What Does The Second Number In Oil Mean?

What do the numbers mean on oil?

The first number in the oil classification refers to a cold weather viscosity. The higher number, following the “w” refers to hot weather viscosity, or how fluid your oil is at hot temperatures. The higher the number, the thicker the oil at a specified temperature.

What does 5w30 mean in engine oil?

5w30 motor oil has a winter viscosity grade of five, meaning it’s less viscous (less thick) at very low temperatures compared to, say, 10w30. It has a hot viscosity grade of 30, which means it is less viscous at high temperatures than an oil such as 5w50.

What do oil numbers mean 10W-40?

The designation “10W-40” indicates a multigrade oil that is toward the low end of the SAE scale in cold weather, but at the upper end in hot conditions. 10W-40 oil is therefore good for a wide range of weather conditions.

What is the second number in oil rating?

The second number after the “W” indicates the oil’s viscosity measured at 212 degrees Fahrenheit (100 degrees Celsius). This number represents the oil’s resistance to thinning at high temperatures. For example, 10W-30 oil will thin out at higher temperatures faster than 10W-40 will.

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Can I use 5w30 instead of 0w20?

These days every motor oil is multigrade motor oil. But among them, 0w20 and 5w30 are famous due to their top-notch performances. If you add 5w30 to your vehicle instead of 0w20, the performance of your vehicle will not affect much. Your vehicle will continue to run smoothly and providing you comfortable rides.

What does SAE 30 oil mean?

SAE30 is a straight 30 weight oil used on your lawn mower and other 4 cycle outdoor equipment. SAE30 weight oil is rated only at the full operating temp of the engine. This means it is much higher than 30 when cold. Sometimes so thick that it cannot flow if it is cold enough out. The W means winter.

What happens if I use 5w40 instead of 5w30?

In practice, this means that each oil is just as viscous at lower temperatures and will remain viscous at -30°C, however 5w40 oil outperforms 5w30 oils at higher temperatures, being effective up to ambient temperatures of 50°C, as opposed to 30°C.

When should I use 5w30 oil?

5w30 engine oil is suitable for automotive gasoline engines, light-duty petrol engines, and light-duty diesel engines. The oil gives a food flow in low temperatures, and thus it is the appropriate choice for cold climates.

Can I use 10w40 instead of 5w30?

Your vehicle does not use 5W-30 oil. The recommended oil viscosity for your vehicle, according to Kia documentation, is 10W-40. If you drive the vehicle in exceptionally cold weather, well below 32 degrees, you can use 5W-30 oil but even 10W-40 is still perfectly OK to use if outdoor temperatures are below freezing.

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Is 10W40 good for summer?

This oil type remains thicker at 100°C/212°F compared to an SAE 30 high-temp flow grade and is more suitable for warm weather. Either 10W30 or 10W40 for summer use is fine; however, 10W-40 motor oil will better protect your engine.

Is Thicker oil better for older engines?

Newer vehicles can utilize thinner oils for faster lubrication of new engine parts. In contrast, older, high-mileage engines benefit from thicker oils to prevent friction and oil loss.

Which is better 10W40 or 20W50?

10W40 is not better than 20W50 for high mileage. The difference between 10w40 and 20w50 is simply that the latter is thicker. As far as gas mileage goes, no oil will improve your gas mileage by changing from 10W40 to 20W50 or vice versa.

What is the difference between 0W 20 and 5w 20?

Although 5W20 and 0W20 (0W20 synthetic oil) can be used at 20°C/68°F, 0W20 is thinner than 5W20 with cold engine temperatures, especially during the first few minutes after you start your car. New cars specify it because it gives the car a bit better fuel economy compared to the 5W20.

What number means thicker oil?

You might be familiar with terms such as “30-weight” or “10W-30” oil. Those numbers refer to the grade. The higher the number, the thicker the oil. The lower the number, the thinner.

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