I was wondering if they weren't tight enough....but I had the same concern about over torquing them, as I have broken three valve cover bolts in the past, one being broken off and becoming lodged in the engine block itself. On the other hand, the leak does appear to be coming from atleast one of the bolts. But the gasket is brand new, which means its still good and as I am under the car I can see the gasket is about 1/4 of an inch ( if not more) in thickness. I tightened it some and notcied I was able to reduce the thickness by 1/4 of that, which means it ws not as tight as I thought it was.....however, as I mentioned before I was afraid of over torquing so I stopped. I don't own a torque so I am unsure of when I am at spec. Should I try tightening it more?

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1990 190E 3.0L