Looks like a headgasket issue...

[Huskymaniac]

...on the Tribeca.

Wife came home and the car was "making a funny noise". I came out and heard a hissing noise. That's not good. Saw a liquid pooling under the car. That's not good. I thought I smelled coolant. Ugh. Then I dipped my finger in the liquid and it was oily. WTF? Popped the hood. Overflow tank looked normal for level. Checked the dipstick. Definitely lost a little oil. Level was halfway between L and H. Looked under the car and it looked like the leak was coming from near the oil filter. Popped off the cover and looked up there with my scope. The oil filter and sandwich style oil cooler looked clean. I couldn't see where the leak was. Temp gauge had definitely gone above midway but CEL was off. Checked the coolant in the overflow tank and it looks like watered down Cola.

I am assuming the headgasket. But why didn't the overflow tank overflow? And why did I get the hissing from under the engine? Could the oil cooler have sprung a leak? Could something worse than a headgasket have failed? I heard no other unusual noises when the engine was running nor did I see anything on the dipstick other than honey colored oil.