Don't matter - try Envirosafe RE12 replacement.
R134a
R-12
Disposable refrigerant containers are only used for virgin refrigerant.
A 1998 Buick would use R134a refrigerant.
Factory R-12 Should be conveted to R-134
coralicigal
Your condensor outside , where the compressor is . should have an information plate showing the type of refrigerant used
r-134a
R134a
r134
R 134 a
134a