What is No. 8 Hydraulic Oil?

2 Answers
OBrynlee
07/25/25 1:44am
No. 8 hydraulic oil is primarily used in the hydraulic automatic transmission systems of various passenger cars and light trucks. Specific details are as follows: 1. Hydraulic transmission oil serves as a working medium in vehicle automatic transmissions composed of hydraulic torque converters, hydraulic couplings, and mechanical transmissions, utilizing the kinetic energy of the liquid to transmit energy. 2. Hydraulic transmission oil is essentially a high-quality hydraulic fluid with higher viscosity index, thermal oxidation stability, anti-wear properties, and superior cleanliness. Additional notes on application: 1. Hydraulic transmission oils of the same grade from different manufacturers should not be mixed. Specific application matters must be consulted with professional oil application engineers. 2. The storage period should not exceed one year, and the oil should be sealed and stored at room temperature. If storage conditions change, the oil must be inspected by oil professionals to confirm its suitability before use. 3. Manufacturers only provide technical reference data for the oil. The specific physicochemical technical parameters of each batch of oil should be based on the actual data provided by the manufacturer or distributor and the user's test data.
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McCamilla
08/10/25 4:16pm
I remember using No. 8 hydraulic fluid in my car. It is a type of hydraulic transmission fluid primarily used in automatic transmissions or hydraulic control systems to transfer power and lubricate components. The "No. 8" typically refers to the viscosity grade, such as SAE 8 or a similar standard, indicating better fluidity in low-temperature environments to prevent system sluggishness due to thick oil during winter startups. From my experience, this type of oil is not only used in private vehicles but is also common in construction machinery like bulldozers and excavators. Extra caution is required when replacing it—mixing different brands of oil is not advisable, as differences in additives can reduce lubrication effectiveness or even damage seals. Regularly checking the oil quality every two years or 40,000 kilometers helps avoid transmission overheating or wear, which is a cost-effective and hassle-free habit.
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