Engine : Refrigeration AC - 674/610
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| The color and/or condition of the oil observed in the sight glass of an operating refrigeration compressor experiencing bearing wear or piston scoring would be which of the following? |
| A) clear, because the heavier particles would gravitate to the bottom of the sump |
| B) gray or metallic |
| C) as a light blue-green |
| D) black |
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