I have some old Mercon transmission fluid and was wondering if it will work in my truck that calls for Mercon-V?
Mercon is a brand name used by Ford for their transmission fluids. The original Mercon fluid is a conventional fluid, roughly equivalent to Dexron. Mercon-V is a synthetic based fluid. Mercon-V could be used in place of Mercon, but not the other way around. Mercon does not meet the specifications of Mercon-V and should not be substituted.