The upper oil seal on the cam is leaking. It probably wont jump time due to this but the timing belt may be damaged by the oil.
I would suspect a leaking water pump, if I remember correctly it is mounted right in front of the timing cover and if it is leaking from the back the water will find it's way out somehow.
Noise coming from the area of the chain and in severe cases it will jump a tooth and the engine will run very badly with no power.
your main oil seal on the rear of engine is leaking or the timing cover seal is leaking,
overfueling, ignition/valve timing out, or hopefully just air leaking through knackered exhaust gasket into pipe, all causing secondary combustion.
Failed gasket.
its having its period
Head gasket, timing cover gasket, or hose leaking.
Bad points , leaking or fryed coil, shorted wires leading to timing device.
Head gasket is leaking
My wife's car had this problem. if the leaking is coming from the front of the engine, the water pump is probably bad. If the leak is coming from the right side of the car, your heater hoses might be bad or the core could be shot. If your water pump is bad, plan on replacing your timing belt. you have to move it to replace the water pump and it is just as easy to change it at the same time.
Timing cover
A Dodge Durango does not have a timing belt. It has timing chain. If the timing cover chain gasket is leaking it is normal to change it while changing the water pump.