What is the difference between engine oil 5W 40W and 15W 40

The exact will be 5w-40 or 15w-40"-"The previous W indicates that the oil is used in the low temperature season, the pour point of 15W is not higher than -23 degrees, the pour point of 10W is not higher than -32 degrees, and the pour point of 5W is lower；- After 40, it means that the oil can work normally at about 40 degrees, and the temperature range of 5w-40 oil is maximum, and now you can use 40 in summer (without the letter w). The two types of engine oil you mentioned are now interchangeable, and it is best to 5w-40 in winter.

Choice of oil.

For common Japanese and American cars, such as: Toyota, Honda, Mazda.

Ford, whose engine is designed to be more sophisticated, is suitable for those oils with good cleanliness and not very high viscosity (around 20). Most of the Japanese cars on the market.

It is more suitable for 0w w20 type of engine oil.

The operating conditions of the two oils are the same at high temperatures. The 5W one at low temperature is better than the 15W one.

5W means that the coldest temperature can be lubricated normally in the range of minus 30 degrees Celsius.

15W is estimated to be above minus 20 degrees Celsius temperature can be lubricated normally.

40 means that the hottest is 40 degrees above zero, and the working conditions are normal. I guess you made a mistake, there won't be a 40w markup.

Hello. There are 6 types of winter oils, 4 types of summer oils, and 16 types of winter and summer general oils.

1.The oil grades used in winter are: 0w, 5w, 10w, 15w, 20w, 25w, the symbol w represents winter, the smaller the number before w, the smaller the low temperature viscosity, the better the low temperature fluidity, and the lower the applicable minimum temperature;

2.The higher the number, the greater the viscosity, and the higher the applicable maximum temperature;

3.The general oil grades in winter and summer are: 5w w w w

The difference between 5w-40 and 5w-30 is only the difference between the following numbers, 40 can be used in summer temperatures below 40 degrees, and 30 can be used in temperatures below 30 degrees. [Car questions, ask the car master.] 4S shop professional technician, 10 minutes to solve. 】

Hello, the temperature adaptation is not the same.

Hello. The temperature of adaptation to the environment is not the same. Hope it helps.

W is the first letter of winter, which means winter and cold, and the number before W represents low temperature resistance.

Whether it is Castrol, Shell or other brand oils, they are accurately labelled in accordance with recognised standards.

Explanation of terms: motor oil labeling.

The smaller the number before W, the stronger the low temperature resistance, such as 0W can resist minus 35° low temperature, 5W can resist minus 30°C low temperature.

In the southern region, the temperature is relatively high all year round, and it is difficult to encounter extremely cold weather, usually 5w is enough.

In the northern winter, the temperature is low and the continuous low temperature time is relatively long, so it will be better to choose 0w.

The number after "w" is the viscosity of the oil at 100, the higher the number, the higher the viscosity, the better the protection of the engine at high temperatures. That is, high temperature resistance, the higher the number, the better the high temperature resistance.

For example, 5w-40 is basically universal in all seasons of the country, and there is no problem.

"W" stands for "winter" which means used in winter, and the 5 in front of "W" represents the viscosity at low temperatures, and the smaller the number, the stronger the fluidity and cold resistance at low temperatures.

"30" refers to the viscosity at 100, and the higher the number, the higher the viscosity and the stronger the ability to withstand high temperatures.

The oil of 5W-40 is much cheaper than that of 0W-40, is there really a difference in the actual driving experience? Don't waste it.

The main difference is in the low temperature resistance of the two oils, the W in 5W-40 represents the smaller the number in front of the W in winter, the better the low temperature operation, in addition to the low temperature viscosity grade, there is also a high temperature viscosity grade 40 to indicate the viscosity of the oil. The difference between 5W-40 and 0W-40 engine oils is the degree of low temperature resistance.

5W-40 is not necessarily synthetic, 0W-40 oil is synthetic. 5W-40 oil has worse low temperature resistance than 0W-40 oil.

0w-40 oil has better low temperature fluidity than 5w40 oil.

On the outer packaging of motor oil, we often see SAE and API. SAE is the abbreviation of the Society of Automotive Engineers, and API is the abbreviation of the American Petroleum Institute. The designation after the SAE indicates the viscosity value of the oil, while the designation after the API indicates the quality level of the oil.

10W-40 is its SAE standard viscosity value, this viscosity value first indicates that this oil is a re-grade lubricating oil (there is basically no single-stage lubricating oil in the civil field), W stands for Winter, and the number in front of W represents the pour point temperature, which is simply the freezing point temperature. The corresponding freezing point temperature of 10W oil is -25, other common 0W is -35, 5W is -30, and 15W is -20. The number after w represents the kinematic viscosity of the oil at 100, and the higher the value, the higher the viscosity.

40 represents 100 degrees Celsius, and the kinematic viscosity standard is between to, which is definitely not what some people say can be used below 40. You know, the temperature of the engine does not necessarily depend on the ambient air temperature, the engine temperature can easily reach 100 for a long time of high rotation, but we do not have 100 lubricating oil for a long time.

The two differ only in resistance to external low temperatures:

5W of 5W-40 oil represents resistance to external low temperatures of -30°C.

0w in the 0w-40 engine oil represents the external low temperature resistance is -35.

The grades of winter oil are: 0w, 5w, 10w, 15w, 20w, 25w, and the symbol w represents the abbreviation of winter (winter).

The smaller the number before w, the smaller the low temperature viscosity, the better the low temperature fluidity, and the lower the applicable minimum temperature, which means that the lower the ambient temperature available for use, and the better the ability to protect the engine during cold start.

The difference between 5W-40 and 15W-40 oils is the low-temperature fluidity, applicable ambient temperature range and viscosity grade. The viscosity of 5w40 oil is less than that of 15w40 oil. Engine oil, also known as engine oil, is a lubricating oil used to lubricate the moving parts of the engine crankcase.

1w40 oil and 5w40 oil are the viscosity grades of motor oils, which represent the ambient temperature at which the oil is suitable. Both of these viscosity grades are all-season oils.

The 15w40 viscosity oil is suitable for ambient temperatures ranging from -15 to 40.

The 5w40 viscosity oil is suitable for ambient temperature range of -30 40.

The oil also cools and cleans the engine. Engine oil consists of base oils and additives. Base oils are mainly refined mineral oils, synthetic oils, or blends of refined mineral oils and synthetic oils.

Additives include antioxidants, viscosity index improvers, pour point depressants, anti-corrosion and rust inhibitors, cleaning and dispersing agents, friction modifiers, anti-wear agents, etc.

If you want to choose the right oil, it depends on the applicable environment. If the temperature is low, choose 5w40. One thing to keep in mind is that 10w40 is suitable for areas with higher temperatures in the south, often driving intensely, used in hilly and mountainous areas, with heavier loads, and vehicles that run for a long time, such as taxis, vans, minivans, etc.

Finally, it is necessary to understand the role of engine oil, such as lubrication, friction reduction, cooling, cleaning, etc. It can be seen that the role of engine oil is very large. Millions of car purchase subsidies.