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Old 10-11-2012, 08:25 PM
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DOT3 vs DOT4

My car manual calls for DOT3 brake fluid, would it be fine if I went with DOT4? All it does it increase boiling point?

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Old 10-11-2012, 08:41 PM
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dot 4 is synthetic
dot 3 isn't


they don't play nice together..
I'd stick with type 3
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Old 10-11-2012, 08:43 PM
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Aren't you confusing DOT 4 and DOT5? I'm pretty sure I've read on label that you can intermix dot 3 and 4 but NOT DOT5
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Old 10-11-2012, 08:54 PM
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Dot 4 is ok

Dot 3, 4, & 5.1 are glycol base
Dot 5 is silicone base
don't mix the 2 base types together.
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Old 10-11-2012, 09:35 PM
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yup. my bad dot 5 is syn
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