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What is Hydraulic Transmission Oil?

2 Answers

DiMargaret

07/25/25 12:44am

Hydraulic transmission oil is actually a high-quality hydraulic oil with higher viscosity index, thermal oxidation stability, anti-wear properties, and superior cleanliness. Functions of Hydraulic Transmission Oil: Hydraulic transmission oil, also known as Automatic Transmission Fluid (ATF) or automatic transmission oil, serves as a working medium in vehicle automatic transmissions composed of torque converters, hydraulic couplings, and mechanical transmissions. It transmits energy through the kinetic energy of the fluid. Applications of Hydraulic Transmission Oil: No. 6 Hydraulic Transmission Oil: Primarily used in large vehicles such as diesel locomotives, heavy-duty trucks, tracked vehicles, and off-road vehicles for torque converters and hydraulic couplings. It can also be used in the hydraulic transmission systems of construction machinery. No. 8 Hydraulic Transmission Oil: Mainly used in the hydraulic automatic transmission systems of various passenger cars and light trucks.

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GiannaRose

08/10/25 3:50pm

Speaking of automatic transmission fluid (ATF), it's literally the lifeblood of automatic transmissions! It performs two main functions: first, it transmits engine power to the gearbox through hydraulic pressure, and second, it lubricates gears and bearings while cooling them. I once knew someone who tried cutting corners by using regular engine oil instead, and it completely destroyed their transmission. This fluid must be specially formulated to withstand high temperatures and resist foaming, as transmission temperatures can exceed 100°C during operation. I recommend changing it every 40,000 kilometers or two years - if you notice the fluid turning black or emitting a burnt smell, replace it immediately. Always use the manufacturer-specified type; using the wrong ATF (like putting non-JW fluid in Japanese cars) can cause slippage!

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