Sludge may form in the crankcase of an air conditioning compressor as a result of what condition?

Correct Answer: Option D — overheating and carbonization of the oil in the crankcase

Overheating and carbonization occur when high discharge temperatures break down the lubricating oil. These carbon deposits, mixed with oil, form sludge in the crankcase. This process is often exacerbated by poor cooling or high compression ratios, leading to oil degradation and potential mechanical failure of the compressor.