After having a AC compressor fail on a 190E. we found out that it was out of oil. After that I had my mechanic pull the compressors on every Benz that I bought and put in an oz or so of oil if they were low. My '87 300E has the original compressor as does my '93 300CE and the '95 E420.
Just my observations on compressor maintenance.
Anziani
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