What are the reasons for transmission oil failure?

[McJonathan]

Transmission failure reasons: Transmission temperature is too high; Transmission fluid not replaced for a long time, leading to fluid deterioration; Transmission torque converter lock-up function failure; Transmission cooler clogged or cooling fins bent; Water ingress into transmission; Hazards of not changing transmission oil: 1. Damage to transmission shift control mechanism; 2. Abnormal wear of transmission gears and clutch plates; 3. Affects normal operation of transmission, leading to valve body damage. Transmission oil and engine oil are different. Although both serve lubricating purposes, they perform different functions and should not be confused. Differences: Engine oil is the lubrication oil for the engine system, possessing certain anti-oxidation, anti-wear, and anti-corrosion properties. Transmission oil mainly maintains cleanliness of the gear system and extends the service life of internal transmission components. Because transmissions and engines have different structures and operating environments, transmission oil cannot be used as engine oil, nor can engine oil be used as transmission oil.

[DeJessica]

I previously had transmission fluid issues with my old car, mainly due to improper daily maintenance. Many people think transmission fluid doesn't need to be changed as frequently as engine oil, but that's actually wrong. When the fluid deteriorates, its lubrication and cooling functions decline. Not changing the fluid for a long time allows metal debris to accumulate, clogging the fluid passages. Also, aggressive driving causes the transmission to overheat, accelerating fluid oxidation. Additionally, seal aging leading to leaks is a common issue—you need to regularly check the fluid level. If you notice gear shifting hesitation, unusual noises, or poor acceleration, don't delay—get it checked immediately. Changing transmission fluid once isn't expensive, so don't wait until you need a major transmission overhaul to regret it.

[McAyla]

Transmission fluid issues are mostly caused by neglecting regular maintenance. Many car owners delay oil changes for too long, exceeding 60,000 kilometers without replacement, leading to fluid degradation. Additionally, prolonged high-load operation of the transmission, such as towing heavy loads or frequent traffic congestion, can cause excessively high oil temperatures that break down and render the fluid ineffective. The use of substandard oil is another factor—incorrect viscosity or poor additives directly affect shift smoothness. Oil leaks should also be monitored, as aging seals or damaged oil pans can result in insufficient fluid levels. Ignoring these minor issues allows them to accumulate over time, damaging internal transmission components and significantly increasing repair costs.

[LaKinsley]

Transmission oil failure is usually related to maintenance. If the oil change interval is not followed, the oxidized oil loses its cleaning properties, and metal debris from friction clogs the filter screen, leading to poor oil flow. Aggressive driving habits that frequently cause excessive oil temperatures also accelerate aging. Additionally, aging oil seals causing leaks or the use of mixed oil products can trigger problems. Sometimes, mechanical wear in the transmission itself, such as metal particles from gear slippage contaminating the oil, is the cause. Early intervention is crucial; otherwise, it can affect gear shifting or even burn out clutch plates.