30s class | Engine Oil Index SAE!

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30s class | Engine Oil Index SAE!

Hello, car owners

It's getting cold. I wonder if you changed the oil

If your oil grade can't handle the cold

Then it needs to be replaced quickly

Today, Xiaobang tells us about it

Winter oil change is a very key indicator

SAE

The oil is labeled

SAE

Viscosity number

SAE

SAE: American Society of Motor Vehicle Engineers abbreviation, SAE grade is the oil viscosity class classification code. It is an important reference index when choosing oil.

W value

W stands for winter (winter), and the number 5 on the left of W represents that the oil is suitable for the external minimum degree of -30 ° C. The smaller the number in front of W, the lower the low temperature viscosity of the oil, the better the fluidity, the lower the temperature of the external environment, the better the protection ability of the engine when it starts cold.

Kinematic viscosity value

The number 20 after W represents the oil viscosity value of 7.5 when the engine is 100℃. The higher the number after W, the higher the kinematic viscosity of the oil at 100 ° C. Different models of engines have different recommendations for kinematic viscosity values, such as:

Kinematic viscosity recommended by German system (100℃) range 11.5-16;

Kinematic viscosity recommended by Japanese system (100℃) range 8-11;

Recommended kinematic viscosity (100 ° C) range 10-11.5;

The kinematic viscosity recommended by Korean system (100℃) ranges from 10-11;

The specific recommended value needs to be consulted by the owner according to his car manual.

Now that we know what is the SAE standard for lubricating oil, how to choose the standard that suits you? Next, Xiaobang analyzes several types of cars for everyone's reference.

// New car

It is generally believed that the state of the new car engine is relatively good, and the viscosity state under the high temperature state does not need to be too high, and low-grade oil such as 5W-30 and 5W-20 can be selected.

// More than eight years old

It is generally believed that the use of low grade oil in the old car engine may produce cylinder pulling, burning oil and other phenomena, and the use of higher viscosity oil can also prevent oil leakage and provide a better seal, it is recommended to choose 5W-40 oil.

// European cars

General European car engine because of the precision design of the cylinder and piston clearance is relatively large, you can choose a relatively large viscosity of 5W-40 oil, so that it can be better sealed and lubricated.

// Japanese cars

The engine design of Japanese cars is more accurate, and the standard viscosity of oil is mostly 5W-30 and 5W-20.

In addition, the oil should be selected according to the local environment, if the environment is low, 5W or 0W label oil should be selected.