Question: What does the car "five oils and three waters" mean?

The "five oils and three waters" in automobiles refer to gasoline, engine oil, gearbox oil, brake oil, steering power-assisted oil and cooling water, glass water and battery water. Their role in cars is extremely important. Let's briefly talk about their functions and filling positions. One or five oils

1, gasoline

Gasoline is definitely the largest liquid in the car, the fuel of the engine and the source of all power in the car (note that all power and electricity come from it). There are 92#, 95# and 98#, you can choose according to the actual situation of your car. There are two kinds of car fuel tank covers, left and right, which can be distinguished by the small arrows on the fuel gauge. When refueling, don't wait until the tank is completely out of oil, and don't overfill it. 2. Machine lubricating oil

Engine oil is the blood of the engine, the most important liquid in the automobile, and the working medium of the engine lubrication system, which plays a role in lubricating and protecting the engine. We need to add and replace them in time according to the model and quantity specified in the manual.

3. Lubricating oil

The function of gearbox oil is to lubricate and cool the gearbox, and it is also the working medium of control system in automatic gearbox. There are two kinds of transmission oil, one is manual transmission oil and the other is automatic transmission oil. There is an essential difference between the two. Don't make a mistake! Automatic transmission oil also includes AT transmission oil and CVT transmission oil, which are also different. Don't confuse them. Transmission oil generally needs 60,000 kilometers to be changed. There are two ways to change the oil. One is the ordinary gravity oil change method, which can only change half of the oil at most, and the other half of the oil is in the torque converter, clutch and brake of the gearbox and cannot be released. The other is the circulating oil change method, which can change 90% of the oil in the gearbox and change it more thoroughly. The disadvantage is that it needs more oil, which may require twice the gearbox capacity. The general oil change cycle is 5000 km, and synthetic engine oil can reach 10000 km. When changing the oil, it must be replaced together with the oil filter. The refueling position is generally on the engine valve cover. There is a dipstick to show the oil level. Don't add too much. 4. Brake fluid

Brake oil is the working medium for transmitting brake pressure in hydraulic braking system, and its importance is self-evident. Brake oils on the market are divided into three types: alcohol ether type, ester type and silicone oil type, but the most commonly used ones are alcohol ether type and ester type. Brake oil grades are divided into four categories: DOT3, DOT4, DOT5, DOT5. 1. Our ordinary cars can use DOT3 and DOT4.

A very important characteristic of brake oil is water absorption. When a new car is driving 1 2 months, its brake fluid may absorb about 2% water; After running 1 8 months, the water content reached 3%, which was enough to reduce the boiling point by 25%. After several years of operation, the water content in brake fluid will probably reach 7-8%. When excessive water is mixed into brake fluid, it will have a great influence on the quality of brake fluid. Water can directly reduce the boiling point of brake fluid. When water enters the brake fluid, the air resistance of the brake fluid is greatly reduced, and the low-temperature fluidity of the brake fluid will also become worse. So water is the natural enemy of brake fluid. When the brake fluid is mixed with water, it must be replaced in time to ensure the normal operation of the brake system. It is generally required to be replaced once every two years. It should be noted that different types of brake oils are not allowed to be mixed. 5. Steering booster oil

Power steering oil is a kind of medium oil filled in the power steering system, which plays the role of transmitting steering force and buffering. Power steering oil is essentially a kind of hydraulic transmission oil, which can be used as long as it meets the relevant requirements. Many repair shops use automatic transmission oil instead. Nowadays, hydraulic power steering is less and less, and it is gradually replaced by electric power steering. Many cars don't need this kind of oil.

There is no clear replacement cycle for steering oil. As long as there is no fault in the steering system, the steering is not heavy and there is no abnormal sound, there is no need to replace it. Replacement is also very simple, just pump out the old oil and add new oil. Second, Sanshui

1, cooling water (antifreeze)

Automobile antifreeze is the working medium of engine cooling system, which has the functions of antifreeze, anti-boiling, anti-corrosion, anti-fouling and lubrication of cooling system parts. Now cars are not allowed to use water instead of antifreeze. According to the freezing point, it is divided into six brands: -25, -30, -35, -40, -45 and -50.

The validity period of antifreeze is usually 2~3 years. We should choose the appropriate freezing point brand antifreeze according to the local lowest temperature in winter, and the freezing point should be at least lower than the lowest temperature 10℃. For example, the local minimum temperature is -30℃, and the freezing point of antifreeze should be below -40℃.

2. Glass water

The so-called glass water is the common name of automobile windshield cleaning liquid. Which belongs to consumables used in automobiles. High-quality automobile windshield water is mainly composed of water, alcohol, ethylene glycol, corrosion inhibitor and various surfactants. It has the functions of cleaning, anti-freezing, anti-fog, anti-static, lubrication and anti-corrosion, which is irreplaceable by ordinary tap water.

It is easy to add glass water. Open the engine room cover, find the glass water box and add it.

3. Battery water

Battery water, also known as electrolyte, is dilute sulfuric acid prepared from distilled water and sulfuric acid. It is added to the battery to react with the electrode plate in the battery to charge and discharge.

Most of the existing batteries are maintenance-free, and there is no need to add battery water, but large trucks and some small cars still use batteries that need water (personally, water-filled batteries for cars are really pit! )。

Although the five oils and three waters in the car are simple, they are indispensable substances to maintain the normal operation of the car. In daily use, we should pay attention to prevent it from being lost and replace it in time according to the model and cycle specified in the manual, so as to protect our car in good condition at all times and serve us better. Hope to adopt. Thank you.