The 1980 Mercedes-Benz 300D originally used R12 refrigerant in its air conditioning system. However, due to environmental regulations and the phase-out of R12, many owners have retrofitted their systems to use R134a refrigerant. If retrofitting, it's important to ensure that the system is properly serviced and compatible with the new refrigerant.
Disposable refrigerant containers are only used for virgin refrigerant.
The most common refrigerant used in refrigerators is R-134a.
I always used Rotella T on my 300SD. I used it exclusively as a truck driver.
coralicigal
Your condensor outside , where the compressor is . should have an information plate showing the type of refrigerant used
134a
r134
R 134 a
r134a
r134
R134a
r-134a