1、自動變速箱溫度過高：自動變速箱運行時會因為內部元件運動摩擦而產生大量的熱量，高溫會破壞ATF的質量和摩擦特性，加劇內部元件磨損，ATF會變成褐色或暗紅色并發出燒焦的味道，同時油泥/雜質等也會在變速箱內部產生，長期不更換變速箱油，將導致油液變質。
1. The temperature of automatic transmission is too high: when the automatic transmission is running, a large amount of heat will be generated due to the movement and friction of internal components. The high temperature will damage the quality and friction characteristics of ATF and aggravate the wear of internal components. The ATF will turn brown or dark red and give out a burning smell. At the same time, oil sludge / impurities will also be generated inside the transmission. The transmission oil will not be replaced for a long time, This will cause the oil to deteriorate.
2、自動變速箱進水：變速箱進水后油液會出現乳狀，一般進水情況有兩種，一種：發動機冷卻液通過散熱器進入自動變速箱；另一種：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，車輛故障并不會立即反映出來，因此車主要定期對變速箱油進行觀察。
2. Automatic transmission water inflow: the oil will appear emulsion after the transmission water inflow. Generally, there are two kinds of water inflow conditions: one is that the engine coolant enters the automatic transmission through the radiator; Another: rainwater or car washing water enters from the vent hole of the automatic transmission. After the automatic transmission is flooded with water, the vehicle fault will not be reflected immediately, so the vehicle mainly observes the transmission oil regularly.
3、油面高度差誤大：自動變速箱油位的高低，也將影響自動變速箱油的品質，從而出現變速箱故障。油位過低，油泵將吸入空氣，使油液與空氣混合，這種情況變速箱油會產生大量的泡沫，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。
3. Large oil level difference: the oil level of automatic transmission will also affect the quality of automatic transmission oil, resulting in transmission failure. If the oil level is too low, the oil pump will inhale the air and mix the oil with the air. In this case, the transmission oil will produce a lot of bubbles. The excessive oil level will cause the planetary gear and other rotating parts to be immersed in the gearbox, causing the phenomenon of stirring oil.
4、摩擦片打滑：變速箱內部離合器、制動器的摩擦元件打滑會引起變速箱油的變質，此時變速箱油液往往呈黑色，并伴有焦味。導致發動機轉速很高，但車速上升緩慢的故障，換檔也會受影響。
4. Slip of friction plate: the slip of friction elements of clutch and brake inside the transmission will cause the deterioration of transmission oil. At this time, the transmission oil is often black with scorching smell. If the engine speed is very high but the vehicle speed rises slowly, the shift will also be affected.
5、金屬零件磨損嚴重：如果變速箱油液中存在大量的金屬碎末，這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、離合器鋼片等。
5. Serious wear of metal parts: if there is a large amount of metal debris in the transmission oil, this is mainly due to the serious wear of metal parts in the transmission, such as intermediate shaft, bearing, clutch steel plate, etc.
6、摩擦材料脫落：這種現象大多出現在自動變速箱進水后，未進行維修，而只是更換變速箱油后繼續使用，造成的摩擦片脫落的現象。
6. Friction material falling off: most of this phenomenon occurs after the automatic transmission is flooded and is not repaired, but only continues to be used after replacing the transmission oil, resulting in the falling off of the friction plate.
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