I put a stethoscope on the compressor, the whine/noise is definitely from the compressor..most likely a bearing.

I will order a reman 10P15C, it comes with a bottle of Ester oil.

My question, is Ester better than PAG?
Or should I get a bottle of PAG instead?
If PAG, what viscosity & how much should I put in?

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86' 190E 2.3L