I would have to disagree with Larry regarding his recommendation of aircondition.com. The site is essentially a bulletin board, comprised mainly of commercial links and no subsections dedicated to Mercedes-Benz. For accurate refrigerant oil refill values for each component of your vehicle's A/C, I still recommend startekinfo.com.
Your A/C system was equipped with ND-8 PAG oil, which has an ISO viscosity of 46. It must be stressed that correct refrigerant oil level is important: too little shortens compressor life, too much reduces cooling efficiency.
Have a look at this article regarding compressor failure and evacuating and recharging a system:
www.babcox.com/editorial/ic/ic50350.htm
If you are interested in learning more about A/C service procedures, you might want to consider the self-study training programs offered by the Mobile Air Conditioning Society:
http://macsw.org/store/dept.asp?dept_id=2
The MACS Refrigerant Recycling & Service Procedures Training Manual can be downloaded, free of charge, from:
www.macsw.org/macs.asp?mfurl=certify.html