My car is leaking oil? Need help!?

Question

I recently changed the radiator in my car (Mercedes C200- automatic) as it exploded when the car over heated. When I put water in my new radiator oil mixed with water seems to be leaking quite badly from black box which is situated between the passenger and drivers seat underneath the car.

I don’t think the head gasket has gone because there is no white residue when I open the part where I put the oil. Any idea what the problem maybe?

Answer 1

sump gasket?

Answer 2

I know when aluminum heads warm up and cool back down they sometimes warp. And may not have a good seal anymore.  

Answer 3

It sounds like head gasket or, more likely, to be a cracked cylinder head. Good luck. h