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Don’t just do any DOT4 - make sure it’s a racing fluid, you’ll boil a regular dot 4. I would just go with SRF as it has the highest boiling points of any fluid. It’s expenive but you’ll go through much less over an RBF600 or similar.
Do a track day on your stock diff fluid, check Cosworth data and see if you see elevated diff temps. I am on stock fluid and never saw elevated diff temps even at 98 degrees ambient.
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