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All electric drive compressors require special ester based oil that typically has a 10MΩ resistance. PAG oil is 1MΩ.
I replaced a compressor on an '06 HCH2. Yeah... needs special oil. 50ml of the stuff was $60.
The good news is that if you're just topping off, you don't need any oil. Just use straight, pure R-134a with no oils, dyes or sealants. My favorite is the $4.88 can of Supertech at Walmart. Get the $15 low side hose and keep it dedicated to the HCH2.
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