Location is directly below the coolant level reservoir.

Please help

 

I had a leak in that spot on a previous X308 that could NOT be fixed. I used three different brand gaskets and even resorted to RTV, it STILL leaked.

Eventually I got another valve cover from the salvage yard. That fixed the leak.

Same exact spot as yours though.

 

The most likely problem is a crack around the bolt hole on the cam cover that opens up when tightened down. Another possibility is the part load breather is plugged at the cam cover orifice and will build pressure on the left bank cam cover. Try pulling the part load breather hose and running a drill bit held by a pair of pliers to clean out the carbon buildup.