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From: SCMR Rat Pack'r Charter Member..Great Bend KS
DOT 3 brake fluid.
We don't need the higher temp rating of DOT 4. The primary differences between the two include the following: DOT 3 brake fluid will absorb less water than DOT 4 from the air over time, meaning you'll need to have your fluid changed less frequently. DOT 4 brake fluid has higher dry and wet boiling points, making it safer for higher temperatures, which is usefor for brake systems, but not needed for the clutch.
Keep it simple.