Can you use transmission fluid for power steering fluid?

I’m about to flush out my power steering fluid, and my grandfather’s telling me I don’t need to buy special fluid, that I can just use the extra transmission fluid I have on hand. Is he right? Can you use transmission fluid for power steering fluid?

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Answer provided by
Rachel Rigolino
Answered on Apr 21, 2022
Technically, some experts say maybe—in an emergency and when it comes to some older, pre-1970s cars—but no, using transmission fluid for power steering fluid is not recommended. You might be able to get away with it because they are both hydraulic fluids, but why run the risk? In today’s cars and trucks, systems are so finely engineered that trying to substitute one for the other is only courting disaster.
A quart of power steering fluid should run you less than $10. And that’s a much less expensive option than hiring a mechanic to fix any damage you might inadvertently do!
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