Q: Can you tell me any details on Mercon SP fluid used in Ford 5r110w trans and what brands offer an equal?
A: Mercon SP is a specially formulated, friction-modified transmissions fluid. Ford does not recommend using any other type of transmission fluid in transmissions that require Mercon SP, which would include so-called “universal” ATFs. However, if a transmission fluid says it meets Ford Mercon SP specifications, it should be safe to use.
Here is a link to the Ford information
–Larry Carley,
Technical Editor, Counterman magazine