What does 20W 40 mean?

Article by: Ing. Ariadna Quiñones | Last update: April 10, 2022
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This W stands for “winter”, and the number indicates the viscosity of the oil at low temperatures. An oil with a low SAE W number will have better fluidity, thus facilitating cold starting and reducing engine wear.

What does 20W 40 mean?

Let’s go back to our first example: 20W 40, the second digit (40) indicates the degree of viscosity with which the motor is protected while it is working. It is worth saying that the higher the number, the better the performance of the oil at high temperatures. With respect to API, these acronyms stand for American Petroleum Institute.

What does 20W mean?

what the numbers mean

The “20W” indicates how fast the engine starts when cold or in cold weather. The “50” refers to the thickness of the oil when the engine has been running for a while. 20W50 motor oil is relatively viscous and thick. Most modern oils are 10W40 or even 5W40.

When is 20W50 oil used?

A 20W-50 motor oil is often used in older cars or in especially hot climates. Castrol GTX 20W-50 has been specially formulated to extend the life of your engine by keeping it free of sludge, even in extremely high temperatures.

What does 20W-50 mean?

These are the temperatures at which the oil will have the optimal viscosity and performance to work inside your car. So the 20w-50 means that the correct minimum operating ambient temperature for this oil will be 20°C and the maximum 50°C.

22 related questions found

What type of oil is 20w50?

20w50 oil

It is also a mineral oil formulated for cars with greater wear, its performance is recommended for 5 thousand kilometers. The range is between -10ºC to 40ºC. This oil is special for summer temperatures that exceed 30ºC.

What does 30w50 mean?

The smaller the number, the more fluid the oil will be at engine start-up. The second number represents the viscosity of the oil at engine operating temperature: 20, 30, 40 or 50. This means that the higher it is, the more viscous the oil will be.

What happens if I mix 15w-40 oil with 20W-50?

I must not mix oils

It is not recommended to do it, except in an emergency, since it will end up losing viscosity and additives, which will result in poor engine lubrication.

What is the difference between 15W40 and 20W50 oil?

The 15W40 is recommended for engines with power requirements and moderate demand. The 20W50 is specially designed for high mileage vehicles that by design require a lubricant with a higher viscosity index.

What is the difference between 5W-30 and 20W50 oil?

This means that 20W-50 is more viscous than 5W-30 motor oil once the engine reaches the proper temperature for driving. The more resistant the motor oil is to thinning as it heats up, the higher your second number will be.

What is the meaning of the W in the oil?

The SAE classifies lubricating oils in Grades W (winter), which refer to the properties of the cold oil, which range from 0 to 25. (Ex: 0W, 5W, 10W, 20W and 25W) and in Grades not W-, which show the suitability of the oil for high temperatures, ranging from 20 to 60 (eg: W-20, W-30, W-40, W-50 and W-60).

When should 15W40 oil be used?

The 15W40 lubricating oil is precisely designed to protect the diesel engine of trucks, trailers and tractors, since it supports the differences in operation between a car and these vehicles.

When is 15W40 oil used?


As a 15W-40 viscosity grade, it flows like a 15 viscosity oil from winter start-up; however, it provides anti-wear protection 40 once the engine reaches full operating temperature.

What vehicles use 15W40 oil?

Mobil Special 15W-40 and 20W-50 are recommended for use in cars and light-duty trucks with gasoline engines that require an API SM, SL, or SJ oil.

What happens if I mix 15w50 and 20w50?

Guest. Re: Can you mix 15W-50 with 20W-50? Japri, there is no problem mixing different grades, the result will be an oil of intermediate graduation (17.5-50 if you do it in equal parts).

What happens if oil of different viscosity is combined?

Mixing two oils with different viscosities is a mistake, because they don’t interact. It is as if water and oil were poured into the same container, which never mix. Regarding the specifications, if one of the specifications of the mixture is higher, it means that the lower ones will be met.

What happens if you mix a 5 W 40 with a 10 W 40?

Re: 5w40 and 10w40 oil mix

Nothing happens, normally this type of lubricants are synthetic or semi-synthetic. The final viscosity will depend on the amount mixed of one and the other, and will be between 5 and 10 when cold, while when hot it will continue to be approximately 40.

When to use 5W 50?

A 5W-50 motor oil is suitable for a wide range of applications, including power sports, classic/collector cars, and extreme driving conditions such as towing and elevated operating temperatures.

What does 15w 30 mean?

The “W” stands for “winter”, the number before it indicates the viscosity (or thickness) of the oil at low temperatures (hence the W), and the number after it indicates the viscosity at higher temperatures, when the engine is working.

What does it mean in 5W 40 oil?

What does 5W-40 really mean? The “W” stands for winter, the number before it indicates the viscosity (or thickness) of the oil at low temperatures (hence the “w”), and the number after it indicates the viscosity at high temperatures. higher (150 ºC on average), when the engine is actually running.

How long does 20W50 oil last?

The oil has a lifespan equivalent to the rate of use of the vehicle, although there is a very efficient average that simplifies change times; This is 6 months or 7,500 kilometers, whichever comes first, as this fluid begins to burn from use, thickening and losing its properties…

What does 15w40 mean and to which group does it belong?

If this were true, a 15W 40 oil would be grade 15 at low temp and 40 at high temp. That means that this oil would “thicken” with the change in temperature, which is not true. The reality is that 15W 40 oil is thicker at low temperatures than it is at high temperatures.

How to know what viscosity of oil to use?

The lower the number, the lower the viscosity of the oil and the faster the oil will move around the engine. As an example, let’s compare 5W-20, 5W-30, and 10W-30 motor oils. A 5W-20 and 5W-30 will have very similar or not the same viscosity at lower starting temperatures.

Which oil is thicker 40 or 50?

The smaller the number, the more fluid the oil will be at engine start-up. The second number represents the viscosity of the oil at engine operating temperature: 20, 30, 40, or 50. The higher the number, the more viscous the oil.

What does SAE 10W 50 mean?

Motorcycle oils that contain a 10w50 nomenclature, this determines the lubricity range, in this case for you to understand better, the number 10 is its cold level, for this reason the letter W (Winter or winter), this guarantees a clean start and bold.

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