Recharge AC System

[73StangCoupe]

All,

I have a 1973 Grande Coupe with AC. Lately the compressor sounds like it is struggling to work. My system has been converted to R-134a. The AC is still blowing pretty cold. I did some reading in the shop manual and some “google” research and I think the compressor may need oil. I’m searching for oil that I can put in and there are different viscosities available. I see Interdynamics R-134a PAG 46 w/ICE 32 Oil Charge (3 oz.) which is listed as a low-viscosity oil, and Interdynamics R-134a PAG 150 w/ICE Oil Charge (3 oz.) which is listed as a high-viscosity oil. Which one should be used in our cars? Thanks…

http://shop.advanceautoparts.com/p/interdynamics-r-134a-pag-46-w-ice-32-oil-charge-3-oz.-pc-1/7010024-P?searchTerm=quest+r-134a+pag+oil+charge

http://shop.advanceautoparts.com/p/interdynamics-r-134a-pag-150-w-ice-oil-charge-3-oz.-pc-3/7010026-P?searchTerm=quest+r-134a+pag+oil+charge

 

[judge]

The thinner appears to extend compressor life. I just happened to have put that in a friends driver car last week. It quieted his compressor immediately. I'd use it again. Was pleased with it.

 

[73StangCoupe]

The thinner appears to extend compressor life. I just happened to have put that in a friends driver car last week. It quieted his compressor immediately. I'd use it again. Was pleased with it.

Thanks judge...

I also found this one after a little more looking. It seems to have have everything I need.

http://www.autozone.com/autozone/accessories/Quest-R-134a-plus-refrigerant/_/N-261q?itemIdentifier=233038_0_0_

 

[judge]

I noticed when I was buying that some brands had more or less oil than others. Also some have sealers added, Also in differing quantities. Just read the contents carefully.