Not sure about the following but here is what I heard from the ford tech at the dealer.
he says that mercon V is a synthetic version of ATF and therefore helps the trans last longer.
I have not been able to find syn mercon V at the local auto parts so for the time being I have to buy it at ford.
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98 SC 4.6L stepside, Gibson headers, Gibson single exhaust, superchip, Intake mods, Piaa's, high end audio stuff.
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