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What is the grade of Harley transmission oil?

1 Answers

JasperFitz

07/30/25 7:47am

Harley transmission oil is generally SAE90. Hazards of not changing transmission oil: 1. Damage to the transmission's shift control mechanism; 2. Abnormal wear of gears and clutch plates inside the transmission; 3. Affects the normal operation of the transmission, leading to damage of the transmission valve body. Transmission oil and engine oil are different. Although both serve a lubricating function, their roles are distinct and should not be confused. Difference: Engine oil is a lubricant for the engine system, possessing certain properties like oxidation resistance, anti-wear, and anti-corrosion. Transmission oil, on the other hand, is primarily used to keep the gear system clean and extend the service life of internal transmission components. Due to the different structures and operating environments of the transmission and the engine, transmission oil cannot be used as engine oil, nor can engine oil be used as transmission oil.

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