Can Power Steering Fluid and Hydraulic Oil Be Used Interchangeably?

[DelEmily]

Power steering fluid and transmission oil cannot be used interchangeably because their viscosity and additives differ, resulting in different performance characteristics. Various lubricants should be used strictly according to the manufacturer's instructions, and mixing them is prohibited to avoid damaging the machinery. Below is additional information: 1. Power steering fluid has low viscosity and high fluidity, whereas transmission oil has high viscosity and low fluidity. Power steering fluid and transmission oil are actually two different types of fluids, and their distinct functions and roles result in differences in fluidity and viscosity. Therefore, these two fluids must never be used interchangeably to prevent damage to vehicle components. 2. From an operational perspective, transmission oil not only lubricates but also transmits force. Due to significant temperature variations during operation, transmission oil operates at higher temperatures than engine oil, requiring higher-quality additives to support machine performance. In contrast, engine oil can use additives with relatively lower quality requirements.