Here is a post that Stevebfl wrote, where he talked about Nippondenso compressors and black death:
W124 Expansion Valve
If the compressor goes, it might be impossible to flush out the system.....
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".