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It's a coolant line to the oil cooler. Note that there is a rubber hose (#26) clamped to a plastic pipe (#70), both are the prone to leaking. The plastic pipe is a pricey part. To replace either or both, you have to remove the airbox, intake manifold and *maybe* the oil cooler itself.
#26 hose part number 271 203 0182
#70 water line part number 271 200 1352
The hose is just held in place by 2 clamps. Maybe try tightening them first, or inspecting the hose for damage? To do so, just unscrew that hose clamp and the hose wiggles right out. Any cracks or holes should be obvious.
My plastic pipe cracked on the other end (where it goes into the engine block). The symptom was a slow weep. Take a look at this DIY thread. If it's the plastic pipe, it can be replaced on the spot (just 1 bolt), if your forearms aren't too thick to reach between the engine and firewall.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
