I haven't checked my oil in ages. I think oil consumption is directly related to how beat up the engine is. If the car hasn't been thrashed, and has been well maintained, it should not consume much oil at all.
You might do a pressure test and leak-down test, and check for dripping leaks on the engine, if you're concerned about oil consumption. There are only a few ways oil can leave the engine. One is by getting by the rings around the pistons and getting burned (a sign you might need a rebuild), another is down valve guides and getting burned (new/rebuilt top end might help), another is through crank-case ventilation (though S62 has lower than typical negative pressure), and the rest are the various seals (valve cover gaskets, etc.).
Grammar: The difference between "knowing your sh*t" and "knowing you're sh*t."
"A world that is 'idiot proof' is a world that is only fit for idiots." - Racer X / 6'er