If you go to Autozone or Checker, you can pick up either Prestone Synthetic Dot 4 or Valvoline Synthetic Dot 4. Both are super high quality DOT 4 with great boiling points (over 500f dry, 311f wet). They are about $3 for a bottle as well. Just be sure to flush the old Dot 5.1 out as much as possible.
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