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Is it ok to mix ATF and power steering fluid in the system?

It is generally not recommended to mix ATF (automatic transmission fluid) and power steering fluid in the same system. Although both ATF and power steering fluid are hydraulic fluids, they are formulated for different purposes and may not be compatible with each other.

Mixing ATF and power steering fluid can cause several issues:

1. Compatibility Problems: ATF and power steering fluid have different compositions and additives. Mixing them may lead to chemical reactions or interactions that can degrade the performance and lifespan of the hydraulic system components, such as seals, hoses, and pumps.

2. Viscosity Differences: ATF and power steering fluid may have different viscosities, which can affect the system's efficiency and performance. The incorrect viscosity can lead to insufficient lubrication, increased wear, and potential component failure.

3. Foaming: Mixing ATF and power steering fluid can cause foaming or aeration within the system. Foaming reduces the fluid's ability to transmit hydraulic pressure effectively and can lead to reduced system performance and component damage.

4. Fluid Degradation: Mixing ATF and power steering fluid can accelerate the degradation of both fluids. The different additives and friction modifiers present in each fluid may react with each other, leading to the breakdown of their respective properties and reduced lubrication effectiveness.

It is always advisable to use the fluids specified by the manufacturer for each system. If there is any doubt or confusion regarding the appropriate fluid type, it is best to consult the vehicle's owner's manual or seek advice from a qualified automotive technician.