The oil is clean and the color is transparent red, indicating that the automatic transmission oil quality is normal. The oil turns dark red and has a slight burning smell. The main reasons are:

一：自動變速器油使用時間過長。一般情況下變速器油應該定期更換，如果長時間不更換，油液就會變質，同時離合器、制動器的摩擦片或制動帶摩擦下來的磨料，使油液顏色變為暗紅色，并有摩擦形成的磨料的燒焦氣味。

1： Automatic transmission oil has been used for too long. Generally, the transmission oil should be replaced regularly. If it is not replaced for a long time, the oil will deteriorate. At the same time, the abrasive rubbed off by the friction plate or brake belt of the clutch and brake will turn the oil color into dark red and have the burning smell of abrasive formed by friction.

二：離合器或制動器存在輕微打滑現象。

2： Slight slip of clutch or brake.

三：制動帶調整過緊。

3： The brake band adjustment is too tight.

四：自動變速器長期超負荷工作，離合器、制動器的摩擦片負荷過大，出現過度磨損。

4： The automatic transmission is overloaded for a long time, and the friction plates of clutch and brake are overloaded, resulting in excessive wear.

五：油液呈黑色，有嚴重燒焦氣味。此現象的產生主要是離合器、制動器的摩擦片和制動帶嚴重磨損。此種油質還經常伴隨的故障現象是自動變速器嚴重打滑。

5： The oil is black and has a serious burning smell. This phenomenon is mainly caused by the serious wear of clutch, brake friction plate and brake belt. This kind of oil quality is often accompanied by serious slip of automatic transmission.

油液特別容易變質或從加油口處冒氣。此現象主要是變速器油的溫度過高引起的。引起變速器油的溫度過高原因有：

The oil is particularly prone to deterioration or gas from the filler. This phenomenon is mainly caused by the high temperature of transmission oil. The causes of high transmission oil temperature are:

一：液力變矩器打滑。

1： Torque converter slipping.

二：自動變速器的離合器、制動器的摩擦片或制動帶打滑。

2： The friction plate or brake belt of clutch and brake of automatic transmission slips.

三：自動變速器油散熱器堵塞。

3： The automatic transmission fluid radiator is blocked.

四：自動變速器循環油管堵塞。

4： The circulating oil pipe of automatic transmission is blocked.

五：自動變速器內裝配間隙過小，引起部件過熱，從而引起變速器油的溫度過高。

5： The assembly clearance in the automatic transmission is too small, resulting in overheating of components, resulting in excessive temperature of transmission oil.

六：油標尺上粘附膠質油膏。此現象的主要原因與（三）所說的一樣，也是油的溫度過高引起的。如果油的溫度長時間過高，就會使油質進一步惡化，形成膠質油膏，當我們拔下油標尺時，在油標尺上面就會發現膠質油膏。引起此現象的另一個原因是自動變速器油質量太差。自動變速器工作條件復雜，劣質油在高負荷、高溫的影響下，極容易變質，產生膠質油膏。

6： Stick colloidal ointment on the oil dipstick. The main reason for this phenomenon is the same as that mentioned in (3), which is also caused by too high oil temperature. If the oil temperature is too high for a long time, the oil quality will further deteriorate and form colloidal ointment. When we pull out the oil scale, we will find colloidal ointment on the oil scale. Another cause of this phenomenon is the poor quality of automatic transmission oil. The working conditions of automatic transmission are complex. Under the influence of high load and high temperature, inferior oil is very easy to deteriorate and produce colloidal ointment.

油液從加油管口溢出。此種現象是由兩個原因引起的：

Fluid overflows from the filler neck. This phenomenon is caused by two reasons:

一：變速器油加注過多。

1： The transmission oil is overfilled.

二：自動變速器上面的透氣孔堵塞。此種情況易引起自動變速器打滑或油液滲透。

2： The vent hole on the automatic transmission is blocked. This situation is easy to cause automatic transmission slip or oil penetration.