FAQ: What Do Engine Oil Numbers Mean?

Is 5w30 oil thicker than 10w30?

10w30 is thicker then 5w30 because it has a higher viscosity in low temperatures. The engine oil will flow slower than 5w30 during the cold season. Thicker or higher viscosity metal oil has a better seal compared to low viscosity oil.

What is the difference in 10w30 and 5w30 oil?

The main difference between 10w30 and 5w30 engine oil is their viscosity grades. 5w30 is less viscous than 10w30. 5w30 is also the thinner engine oil of the two at lower temperatures. 10w30 provides sealing action in the engine due to the fact that it is thicker than 5w30 engine oil.

What do the 2 numbers on oil mean?

Viscosity refers to the thickness of the oil, lower numbers are thinner, higher numbers are thicker. The second number is the viscosity, how it will flow, when hot. So that means a 5w-20 motor oil will have the viscosity characteristics of a 5 weight motor oil when cold.

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What does 5W 40 mean?

What does 5w40 mean? 5w40 is the grade of the oil. The ‘W’ in the oil grade stands for winter. In case of 5w40 car engine oil, the viscosity at cold temperatures is 5, which means, it is less viscous, as compared to a similar oil, for example, 10w40 at the same temperature.

What happens if you use 10w40 instead of 5w30?

Some oil viscosity differences are less pronounced

He knows this because the second number in each oil’s viscosity rating (i.e. “30”) is the same. It describes the oil’s resistance to flow at 212ºF, or normal operating temperature. Using 10W-30 instead of 5W-30, however, could make cold starts more difficult.

Is Thicker oil better for high mileage cars?

Highmileage motor oil doesn’t hurt and it could prevent leaks from starting. Some mechanics recommend switching to a thicker (higher viscosity) oil — such as 10W-30 full synthetic oil instead of 5W-20 full synthetic — or using oil additives to stop leaks.

What happens if I put 5w20 instead of 5w30?

If you put in 5W-30 oil instead of 5W-20 when the latter is the grade suggested by your vehicle’s manufacturer, damage to internal engine parts can occur. Additionally, your engine may experience performance issues such as diminished fuel economy and horsepower. 5 дней назад

Will 5w30 hurt a 0w20 engine?

No, not true. A 5W-30 full synthetic will flow fine. If you look at the owner’s manual for the same Toyota engines in many other countries, they specify 5W-30 for better engine longevity. The reason why they specify 0W-20 (and new cars are trying to go lower such as 0W-16) is for better gas mileage.

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Which oil is thicker 5w30 or 10w40?

5w30 is less viscous while 10w40 is more viscous. The 5w30 has a viscosity of 30 at high temperature while a 10w40 has a 40 viscosity at high temperatures. When at high temperatures, the 5w30 oil becomes thinner than the 10w40 oil since 30 is lower as compared to 40.

How do you read oil numbers?

In a 5W-30 for example, the number before the W describes the viscosity of the oil at low temperatures. The lower the number, the thinner the oil and the better the oil’s cold temperature/ cold start performance. The number after the W describes how thick the oil is at the engine’s normal operating temperature.

What do SAE oil numbers mean?

SAE number, code for specifying the viscosity of lubricating oil, established by the U.S. Society of Automotive Engineers. The numbers for crankcase lubricants range from 5 to 50, for transmission and axle lubricants they range from 75 to 250; the lower the number, the more readily the oil flows.

Can you mix synthetic and regular oil?

Yes. There is no danger mixing synthetic and conventional motor oil. However, conventional oil will detract from the superior performance of synthetic oil and reduce its benefits.

Is 5W 30 better than 5w40?

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.

Can I use 5w30 instead of 5w40?

30 “weight” oil isn’t 3/4 as thick as 40 “weight.” There are requirements for each grade, and each “W” grade. At operating temperature, 5W40 will be slightly “thicker” than 5W30. At operating temperature, the “W” number is meaningless. At lower temperatures, both oils will be similar.

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Can I use 10W-40 instead of 5w40?

10w40 is thicker than 5w40, ONLY when cold. At operating temperature it is exactly the same. Multi-viscosity oils with a lower W number are specifically designed to flow better, and thus lubricate better, at very low temperatures. There is no need to use a 5w-40 if the vehicle only requires 10w40.

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