I am not a Benz gas person...or a gas fuel injector person. I have however had experience with a marine deisel which filled the oil sump with fuel,lots of it, whenever engine was run. The problem was in the injector pump. Due to a gouge, corrosion induced, on one of the parts it allowed excess fuel into the system. I suspect you may have gotten some corroson in either the injector pump or the injectors which is interferring with the opperation of the components. I would suggest pulling the injectors and send them out to be cleaned(internally) and try running again after you change the engine oil again. If this does not correct the condition check the injector pump. These are just my guesses based in the excessive amounts of fuel in the chambers as well as the sump. I hope this helps.