If it goes away after a little while, then something washed off the engine onto the exhaust. If it doesn't go away, then something's leaking...... All I can say is that you'll have to poke around under the hood until you find the answer. This isn't the kind of thing that you can diagnose online.........

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition