Date registered: Oct 2007
Vehicle: 1999 E430 Sport
Location: Crystal Lake, IL
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The seal degradation thing is nonsense.
If it were true, you wouldn't be able to leave your car parked for more than a few days.
New or remanufactured compressors both come with plastic plugs in the ports, primarily to keep dirt out. When a compressor is installed the system must be evacuated with a vacuum pump to remove air and moisture. This is done because moisture in the system can freeze or cause corrosion. It has nothing to do with the seals.
The seal will not dry out unless the part sits unused for years.
If I were in the market for a compressor, a new one would be worth a premium over a remanufactured one.