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I will change my first brake fluid at 50k. Is sythetic any bette orr prestonbrake fluid is fine?
 

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Standard DOT-3 fluid is all you need,, or step up to DOT-4, offers higher boiling point.. Hyundai has recall for us to change fluid up to DOT-4 in the Genisis and EQUUS
 

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Is sythetic any bette orr prestonbrake fluid is fine?
The important part is to stick with the same numerical type or one that is compatible with the DOT 3/4 presently in there.

If you get "cute" and try to "upgrade" to DOT 5 synthetic, the old and new don't play nice together and you can have jelly form in the system and then need an expensive cleaning and flush.
 
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Stick to DOT 3 unless you are in Siberia. Seriously, that and race tracks are the only places where it is worth the hassle of converting to synthetic. So if it doesn't hit -70F or 130MPH+ on your commute, stick to the cheap DOT 3.
 
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