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What is the function of transmission oil?

2 Answers

LaJade

09/06/25 4:09am

The function of transmission oil: It is an oil product used to keep the gear shifting system clean, playing a role in lubrication and extending the service life of the transmission device. It has excellent lubrication effectiveness even under low-temperature conditions and reduces oil loss under harsh operating conditions. Low-quality transmission oil has poor temperature resistance, is prone to oxidation, and can generate sludge and residue, clogging the filter screen, reducing transmission oil pressure, and affecting shifting quality. Most transmission oils can be used in automatic transmissions available on the market. In fact, each automatic transmission design has different technical requirements. Even the same model of transmission configured in different vehicle models will have differences in torque, weight, speed, structure, etc. Therefore, the original manufacturer has its own specified dedicated transmission oil.

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MacCaden

09/18/25 4:05am

Just seeing this question reminded me of the gearbox failure cases I've handled. Transmission fluid plays a super important role in the gearbox - it's like a comprehensive life support system. Firstly, it provides lubrication protection for precision gears and bearings, because metal components would instantly overheat and fail due to dry friction. Simultaneously, it also handles heat dissipation, as gearbox operating temperatures can skyrocket to over 100 degrees Celsius, relying entirely on fluid circulation for cooling. In automatic transmission models, power transfer depends more on hydraulic pressure, where the fluid serves as the key medium directly driving hydraulic valve bodies to execute gear shifts. The sealing protection function is often overlooked - aged/deteriorated transmission fluid causes seal hardening, and oil leaks may lead to complete gearbox failure. I recall a case last month where oxidized fluid formed sludge that clogged oil passages, causing jerky gear shifts like riding a rollercoaster. I recommend following maintenance manual intervals for fluid changes - typically every 2 years or 40,000km (whichever comes first) - never wait until experiencing jerking or slipping before addressing it.

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