Dexron-III/Mercon (D/M) does NOT meet the Mercon V (M-V) or Dexron-VI (D-VI) rating and should NEVER be used in a transmission that requires M-V or D-VI. However, M-V and D-VI both exceed the D/M spec and can be used in a transmission that calls for D/M Transmission Fluid. Despite this, there is really no point in using M-V or D-VI in a transmission designed to use D/M because those transmissions do not get any added benefit from them despite M-V and D-VI being roughly double to triple the price of conventional D/M.
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