Yes, you can mix DOT3 and DOT4.

But given a choice you should buy and add only DOT4 because it's less
hygroscopic than DOT3 - it absorbs moisture from the air slower.

Thanks, Tom Hargrave
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-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Mike Griffiths
Sent: Tuesday, February 1, 2022 3:53 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Brake fluid

Can you  mix DOT 3 and 4?
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