Well, as IBM is fond of saying "it depends..."
On the ML you can drain the oil but you have to remove a cover and the oil drains onto a cross member, very messy!
I love my Wolf marine oil extractor, pulls the ML's oil out in less than ten minutes and handles the warm(hot) oil better than other units. As Larry and John have pointed out, the hotter the better!
Ed "Don't Benz's just feel better..."
2000 ML430 Skyview "The Mel"
2000 CLK430 Cab "The Cab"
85 300D Turbo "The Diesel"
"One should as a rule respect public opinion in so far as is necessary to
avoid starvation and to keep out of prison, but anything that goes beyond
this is voluntary submission to an unnecessary tyranny, and is likely to
interfere with happiness in all kinds of ways."