We were primarily looking at the right rear Passengers side. We concentrated there because it was " more grime and greasy" accumulation there. But we cleaned that entire side all the way to the front. Although not much build up of greasy grim up front. In fact pretty clean up front. and over half way back. And also we looked there because the oil spot on the undebelly pan (plastic tray) seemed to be located near the back area of that pan were it was dripping out the back to the floor. But probably some blow back was occurring there too.

I did check the dipstick and it was just barely over half way between the marks. It was barely warm at that point and not what I would call Hot like described. However I cannot make any assumption that it was perhaps overfull before that point. It certainly would seem it was very likely.

The total amount of oil leaked, and it was fresh clear oil, was perhaps 3-4 tables spoons. If I would venture a guess on total fresh oil on the pan and floor, I would say about 6-8 table spoons or perhaps a half a cup total all together. But I am sure some could have leaked on the way over and not been left to drip off. But what I saw in all could be considered about 100ml or so.

I can tell you that the shop that would have done the oil change was a Honda dealership. And would not have much experience with Mercedes motors. And the owners manual is missing so they would have had to use some sort of other database to decide how much oil to put in or they just did it by eye.

So it is very likely it as a bit over filled. .5 liters would be a fairly large amount too. But... is leaking then normal when over filled? Seems odd to thinks so but... Seems that overfilling is still showing a leak that needs attention doesn't it? Or is Mercedes saying that if it is overfilled and leaks then the fix is to not overfill it? Or should it be considered a leaking Head Gasket and replaced?