The 87 126 should be an OM603 engine. In that case you have a Denso compressor.
That compressor has a sump drain bolt on top near the pulley. It is close to the electrical connector. Be sure to remove that bolt and turn it upside down over a pan. Gently rotate the hub to help push the oil out. I would plan on flushing several oil charges worth through the compressor to get the old oil out. One of the other AC guys on here should know if you can/should solvent flush the compressor.
As for distributing the oil charge, the FSM says you should.
This is for a 124 of the same era the 126 should be similar.
http://w124-zone.com/downloads/MB%20CD/W124/w124CD1/Program/Climate/83-525.pdf
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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)
both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)
1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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