Please message me if you resolve this issue as I have the same exact issues you have mentioned (just that my car is 94 e320 sedan). The smoke has occurred to me a few times after high speed driving, I also have the slight idle issue when car warms up, and I found oil in the same spots with some oil on the spark plug connector for spark plug closest to the firewall (cylinder #6 i believe). The last time I saw the smoke was last summer. For me the smoke occurred on days with hot temperatures outside or it could have coincided with the same oil change that was the culprit. I was going to replace the valve cover gasket and get the kit that comes with 6 little rings for each cylinder.
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