I don't want to have the last word on this issue but one clarification: new MB engines are designed for siphoning, the oil dipstick tube goes to the lowest part of the pan, if you do it properly, you don't get any oil from the plug.
You did not seem to claim that the sludge does not come out this way, this is a common argument. However if one does have that with modern oils and modern engines, then there are some real issues, other than just getting that out of the engine. (no more comments on this topic from me for this thread).
I did some tests and siphoning seems to drain more than pulling the plug on most cars. Some members tilts their cars for oil change to get more oil out, but the stuff in the oil cooler and in the valve alley still stays. In the mentioned Perkins engine I didn't want to mess with beaten up plug and siphoned the oil out using the small tubing. After few hours of use the oil still stays clear, what is the first such occurrence in tens of diesels I used to own. My conclusion is, that Perkins design is not leaving any oil pockets in the engine, like the other brands do. Than it was proved millions times, that as long as you replace 90% of engine fluids, that is sufficient.
What is sludge? Remember seeing some nasty stuff in engines, but that was 25 years ago
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