Date registered: Feb 2008
Vehicle: 2004 W220 (S430) ; 2001 R129 (SL500) Sport
Location: Alabama Gulf Coast--formerly Charlottesville, VA
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Where is it located under the car? Very front behind the bumper, may be coolant, leaking oil cooler, or leaking power steering pump or rack. Under car ahead of windscreen, engine oil. Under car behind windscreen, transmission fluid. Those are best guesses based on the relative location of the components that have fluids that leak. There are various hoses and lines that could result in coolant being near the firewall and so on, but that's the most likely.
Good luck on finding your leak.
"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck