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I'm going to put a new Lares 974 steering box in my 67 Impala. What is the best power steering fluid to use. I am going to flush the system. The power steering pump is fairly new.
 

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I believe DOT5 is synthetic and probably "the best" but if you aren't auto-crossing or in super extreme temperatures, I would probably just use standard DOT3 fluid. Either can be had from any auto parts store - common stuff.
To show my 'un-bias', I have an aftermarket steering box too, and just bought regular ol' parts-store-brand DOT3. Just be aware that you can't keep that stuff on your shelf at home for a long time, it can (over time) absorb water from humid air.
 

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Thanks for the info. I do have an old bottle of it. Now I won't use it. I will buy all new. Do you know how much it will take to flush the old and have enough to fill with all new fluid?
 

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I think he is as well. Power steering fluid is just hydraulic fluid. Since mine leaked from a bad hose I bough it by the gallon from my John Deere dealer. It is all ten weight mineral oil. Even the tranny uses it, but ATF has a red dye in it to warn you that you not only have a leak, but what is leaking, compared to all of the other oil leaks old Chevys have.

Big Dave
 

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With the DOT 5 or DOT 5, I think you are actually refering to Brake fluid.
I think he is as well. Power steering fluid is just hydraulic fluid. Since mine leaked from a bad hose I bough it by the gallon from my John Deere dealer. It is all ten weight mineral oil. Even the tranny uses it, but ATF has a red dye in it to warn you that you not only have a leak, but what is leaking, compared to all of the other oil leaks old Chevys have.

Big Dave



OH ****E! You're both right!! I dunno where my head was at!!! I gotta stop reading the forum while drinking straight Bulleit bourbon!


Sorry! Man, I deserve negative points for that one. :surprise:
 

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Do not put brake fluid in your power steering! It will destroy your pump, and your brand new steering gear. Either use transmission fluid or mineral oil like stated above.
 
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