The quality of automatic transmission oil is an important basis for analyzing the internal problems of automatic transmission. Under normal conditions, the automatic transmission fluid is bright red. If the color and viscosity of the automatic transmission oil have changed, it means that the automatic transmission oil has deteriorated. At this time, it is necessary to replace the automatic transmission oil and clean the automatic transmission thoroughly; If the automatic transmission oil has burnt smell, or the oil state has changed, for example, there is a large amount of powder in the oil, or it has become emulsion, it means that the internal of the automatic transmission has been seriously worn, and the automatic transmission needs to be disassembled for maintenance.

說明情況會導致自動變速箱油變質呢？主要可總結為以下六個原因：

Explain that the situation will lead to the deterioration of automatic transmission oil? There are six reasons

1.自動變速箱溫度過高（自動變速箱溫度過高后，油液就會變成褐色或暗紅色）

1. The temperature of automatic transmission is too high (after the temperature of automatic transmission is too high, the oil will turn brown or dark red)

自動變速箱使用時間長（一般為兩年或六萬公里）不更換，油液就會變質；或者是液力變矩器鎖止功能失效；或者是自動變速箱散熱器堵塞或散熱有個彎曲，都會使自動變速箱溫度過高。

If the automatic transmission is used for a long time (generally two years or 60000 km), the oil will deteriorate if it is not replaced; Or the locking function of hydraulic torque converter fails; Or the radiator of the automatic transmission is blocked or bent, which will make the temperature of the automatic transmission too high.

2.自動變速箱進水（變速箱進水后油液會出現乳狀）

2. Water in the automatic transmission (the oil will appear emulsion after water in the transmission)

自動變進水一般有兩種情況，一種：發動機冷卻液通過散熱器進入自動變速箱；二種：雨水或洗車水從自動變速箱透氣孔進入。自動變速箱進水后，車輛故障并不會在時間顯示，因此車主要實時對變速箱油進行觀察。

There are generally two cases of water inflow into the automatic transmission: one is that the engine coolant enters the automatic transmission through the radiator; Two: rain or car wash water from the automatic transmission vent into. After the automatic transmission is flooded, the vehicle fault will not be displayed in time, so the vehicle mainly observes the transmission oil in real time.

3.油面高度差誤大（這種情況變速箱油會產生大量的泡沫）

3. the height difference of the oil surface is too big.

油位過低，油泵將吸入空氣，使油液與空氣混合；油位過高，會使行星齒輪和其他旋轉部分浸在變速箱中，發生攪動油液現象。無論是過高或過低，都會導致自動變速箱油變質，從而出現故障。

If the oil level is too low, the oil pump will inhale air to mix the oil and air; If the oil level is too high, the planetary gear and other rotating parts will be immersed in the transmission, and the oil will be agitated. Whether it is too high or too low, will lead to automatic transmission oil deterioration, resulting in failure.

4.摩擦片打滑（油液呈黑色，并伴有焦味）

4. The friction plate is slipping (the oil is black with burnt smell)

離合器、制動器的摩擦元件打滑也會引起變速箱油的變質，這種現象會導致發動機轉速很高，但車速上升緩慢的故障，往往換擋也會受影響。

The sliding of friction elements of clutch and brake will also cause the deterioration of transmission oil. This phenomenon will lead to high engine speed, but the fault of slow speed rise will often affect the shift.

5.金屬零件磨損嚴重（變速箱油液中存在金屬雜質）

5. Serious wear of metal parts (metal impurities in transmission oil)

變速箱油液中存在大量的金屬碎末，主要是由于變速箱內的金屬零件磨損嚴重，如變速箱內的中間軸、軸承、離合器鋼片、離合器盅等等。

There are a lot of metal debris in the gearbox oil, which is mainly due to the serious wear of metal parts in the gearbox, such as the intermediate shaft, bearing, clutch steel plate, clutch cup and so on.

6.摩擦材料脫落（油內有雜質，摩擦片的剝落物）

6. Falling off of friction materials (impurities in oil, peeling off of friction plate)

這種現象大多出現在自動變速箱進水后但未進行解體大修，而只是更換變速箱油后繼續使用。在使用過程中往往會出現摩擦片脫落的現象。

This phenomenon mostly occurs after the automatic transmission is flooded, but it is not disassembled and overhauled, and it is only used after changing the transmission oil. In the process of use, the friction plate often falls off.