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I'm trying to find out the correct PAG oil viscosity for a Seiko Seiki SS-121DS5 A/C compressor in a '93 940 with a OEM R-134a system. I've found certain documents stating PAG 100 is the correct equivalent for the SK-20 oil stated on the compressor tag (these PDFs list the SK-20 oil, but not a SS compressor), on the other hand some say that for the Seiko Seiki SS compressors PAG 46 is correct.
Now I am aware of the Volvo part number for the oil from the sticker in the engine bay, but I cannot find anything that lists the equivalent oil type. I've also looked through the FAQ and searched the forums and seems like most of the references to PAG oil viscosity is for the Sanden compressor.
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