R-12 unless it has been converted over to R-134a.
R134a
Unless it has been converted over to R134 it came with R12. I suggest you convert it to R134a. R12 is very expensive.
A 1998 Mercury would use R134a refrigerant.
R134a
R134a
R134a
Mercon V
5W-30
A 2001 Mercury Sable uses R-134a refrigerant for its air conditioning system. This type of refrigerant became common in vehicles after the phase-out of R-12 due to environmental concerns. If you're servicing the AC system, ensure to use the correct type and follow proper guidelines for handling refrigerants.
Was built for R12, should be converted to R134a
dot 3
According to the 2002 Mercury Sable Owner Guide : ( Motorcraft MERCON automatic transmission fluid is used as the power steering fluid )