Clunking noise/Oil Leak

[epapp]

Is it brown? Does it look like coolant a bit? If it is indeed thin like water, it could be the water pump leaking into the plastic under carriage tray, and when on an incline, the water escapes its area that it is pooled in. The brown color could be the coolant mixing with the dirt and dust that accumulates in the undercarriage.

You could always put your tongue to it. If it tastes like poison, then it is probably coolant.

Alternatively, the brown color could be a far worse thing: the oil and coolant mixing, and THEN leaking out of the water pump. Take the lid off of the coolant tank in the trunk and send some picture of the liquid inside the tank.