Mysterious oil leak

[SoCalLowLife6]

I have an oil leak that has oil dripping through the passenger side of the subframe. Also dripping off the passenger side lower control arm bushing. Also, the oil is creating a huge mess on the passenger side under carriage where the o2 sensors originate from. For the life of me I cannot figure this out! I took a few pics. The backside of my engine is relatively clean so I don’t even know where to begin. Thanks for any knowledge!

 

[BudgetPhoenix]

The upper timing cover gasket will often leak down at the bottom and cover the back of the engine with oil and drip down on the back of the subframe on the pass side