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taneqyesterday at 10:47 PM1 replyview on HN

It’s hydraulic fluid, which is oil. It’s not formulated the same as engine oil, but it’s not far off gear oil.


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mikestewtoday at 12:12 AM

It’s hydraulic fluid, which is oil.

Nope, glycol-based and synthetic. Not the best article, but best I could find at the moment:

https://engineerfix.com/what-is-brake-fluid-made-of/