Kmag50,

I use the system of sucking the oil out of the crankcase using the fill port and just replacing the filter. I have found it very easy (as easy as it can be finding a place to dump the used oil). It is easy to do and works well. I can tell you that early on with this site, there were several threads on the issue. I can get the info for you if you wish to pursue that avenue. Do a search or let me know and I'll try to get the site and part numbers for you to order. It was my understanding that Mercedes changes the oil that way. I don't know that for sure, just what I read.