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It sounds like the front crank seal may be leaking which goes behind the crankshaft pulley/harmonic balancer. It keeps oil from leaking so if seal is worn it would cause oil to leak with front of engine on downward slant. This is about a 2.5 hour job and a $50 part so about $300 total for repair to be done at a shop. Let me know if yo have questions, thanks.
Usually the wind from driving down the road blows the oil toward back of engine so you would want to trace leak as close to the front as possible and as high as possible. The large metal triangle you are describing sounds like it is the transmission pan. The reason I say front seal is most likely cause is because there is where oil would be if vehicle was parked downhill. As vehicles age pretty much all of the gaskets are eventually prone to leak. Let me know if you have more questions, thanks.