In this video, I show one way to drain as much as possible of the old / contaminated oil from a "disposable" sealed fridge compressor.

As with most mechanical devices, compressors are generally very reliable until operated outside of their design limits; or when the oil within the compressor no longer protects the moving parts from wear and corrosion.

Many "re-used" compressors fail because they were removed from a system and left open to air. Once exposed to air and moisture, degradation of the the oil results; particularly with more modern POE oil equipped models. If this oil is replaced before putting the compressor back in service, the chance of longterm success is improved.