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On the Dex-Cool, as MarkC stated, if it's true DexCool, I'd stay away from it.

If it's "compatible" with Dex-Cool, it should be ok.

Synthetic DOT 4 is fine. I run it in mine.
However, do a little research before you just buy any old brand.

I found that some of the synthetics actually have a lower boiling point
than the regular brake fluids.
I believe the last bottle I got was Prestone synthetic and had
quite a bit higher boiling point.
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