在汽车保养中，许多车主被“变速箱终身免维护”的说法误导，导致变速箱在行驶十几万公里后出现严重故障。事实上，自动变速箱的工作环境极为苛刻，内部温度常高达120℃，变速箱油肩负着润滑、清洁、散热和传递动力的多重使命。随着时间推移，油液必然氧化变质，产生油泥并堵塞精密阀体。因此，定期养护是预防维修的最有效手段。

In car maintenance, many car owners are misled by the statement that "the gearbox is maintenance free for life", resulting in serious malfunctions of the gearbox after driving tens of thousands of kilometers. In fact, the working environment of automatic transmissions is extremely harsh, with internal temperatures often reaching up to 120 ℃. Transmission oil shoulders multiple missions of lubrication, cleaning, heat dissipation, and power transmission. Over time, the oil will inevitably oxidize and deteriorate, producing sludge and clogging the precision valve body. Therefore, regular maintenance is the most effective means of preventive repair.

科学的养护首先需要遵循合理的更换周期。通常建议AT自动变速箱每4万至6万公里更换一次油液，双离合变速箱每6万至8万公里检查或更换。对于常在拥堵路段行驶或驾驶风格激进的车主，应适当缩短周期。其次，换油方式的选择至关重要。传统的重力换油只能排出约50%的旧油，而循环机换油通过压力循环，换油率可达90%以上，能更彻底地清洗内部油路。但需注意，对于极高里程且从未换过油的车辆，盲目使用循环机可能导致大块油泥脱落堵塞阀体，需由专业技师评估。

Scientific maintenance first requires following a reasonable replacement cycle. It is usually recommended to replace the oil every 40000 to 60000 kilometers for AT automatic transmissions and every 60000 to 80000 kilometers for dual clutch transmissions. For car owners who often drive on congested roads or have aggressive driving styles, the cycle should be appropriately shortened. Secondly, the choice of oil change method is crucial. The traditional gravity oil change can only discharge about 50% of the old oil, while the oil change rate of the circulation machine can reach over 90% through pressure circulation, which can more thoroughly clean the internal oil circuit. However, it should be noted that for vehicles with extremely high mileage and never changed oil, blindly using the circulation machine may cause large pieces of oil sludge to fall off and block the valve body, which needs to be evaluated by professional technicians.

的驾驶习惯是最好的“免费保养”。冷车启动后应温和驾驶，待油温上升后再正常加速；在拥堵路段，双离合车型可切换至手动模式限制换挡次数，或挂入N挡减少离合器半联动磨损；坚决杜绝空挡滑行和频繁急加速、急刹车。这些看似微小的习惯，能极大减轻变速箱的内部负荷，让其长久保持平顺。

The driving habit is the best 'free maintenance'. After starting the cold car, drive gently and wait for the oil temperature to rise before accelerating normally; On congested roads, dual clutch models can switch to manual mode to limit the number of gear shifts, or shift into N gear to reduce semi clutch wear; Resolutely eliminate coasting in neutral and frequent sudden acceleration and braking. These seemingly small habits can greatly reduce the internal load of the gearbox and keep it smooth for a long time.

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