R 12 refrigerant.
If you are unsure use Ester oil. It is safe for all systems and chemicals.
r134
R-134
R134a
About 15 mpg on a 1990 Chevrolet suburban.
r12
1990 Chevrolet suburban gets about 15 mpg.
The 1996 Suburban uses r134 Freon. The fittings to add Freon are different sizes on r12 and r134, making it impossible to add the wrong type to your vehicle.
11 oz
R-12 or "Freezone" (the R-12 equivalent).
A 1989 GMC Suburban typically uses R-12 refrigerant for its air conditioning system. However, due to environmental regulations, many older vehicles have been retrofitted to use R-134a refrigerant. If you are working on a 1989 Suburban, it's important to check whether it has been converted to R-134a or if it still uses the original R-12 system. Always follow proper procedures for handling and disposing of refrigerants.
SAE 10w30 any major brand.