This is not a Mercedes but all diesel or alike some are bigger than other.
Problem is My 81 Nissan Diesel uses a lot of oil (199,000 Miles) it allways has since I owned the truck. It does not have any blow-by at all and does not smoke other than diesel smoke. I am thinking it might be valve seals
you think I am right on this. As long as you let glow plugs warm up it starts up like a new one lot better than my benz 300d.