I'm not familiar with the undercarriage of the SLS, but here's a thought. On my W140, the levelling valve and hoses for the rear suspension are directly over the exhaust pipes. I have a very small leak in one of the return lines. The fluid either drips directly onto the exhaust, or the drops run along a line until they get to a low point, and then drip onto the exhaust. The fluid burns off when the car is running, leaving no trace of the oil. Wipe your lines so that they're clean and dry. Monitor them closely for a while, and see if they are wet.

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1995 S600, 1 of 618 (sold)

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