Greetings Joe,

If they haven't changed anything, Dexron III is compatible to Dexron II just added ingredients to cover higher heat dissipation. The brake fluid you should be using is Dot 3 for high heat dissipation. It is reccommended depending on where you live to completely drain or bleed out the old brake fluid every several years in order to rid the system of accumulated moisture, which lowers the boiling point of your brake fluid causing fading under extreme braking circumstances.

Hope this helps,

Charles