Castrol Transmax DEX/MERC is an mineral based automatic transmission fluid for passenger cares and light trucks. DEX/MERC references a now obsolete specification DEXRONIII/Mercon ATF. DEXRONIII was General Motors Specification and Mercon was Fords specification. For many years this type of transmission fluid covered both manufacturers specifications. While it is no longer specified by these manufacturers in their newer vehicles, it is still very popular in older vehicles.
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