Second opinion] Hi, I have an M156 engine that me and my ...

Second opinion] Hi, I have an M156 engine that me and my friend took apart replaced the faulty cylinder headbolts and other gaskets and now that we've put everything back together the oil is mixing with the [coolant](/topics-coola...

Second opinion] Hi, I have an M156 engine that me and my friend took apart replaced the faulty cylinder headbolts and other gaskets and now that we've put everything back together the oil is mixing with the [coolant](/topics-coolant-mercedes/) and producing chocolate milkshake kind of fluid. When we pour approximately 1 liter or more of water into the coolant holder thingy (forgot the name) it pours out the oil pan in the bottom after 10 or 20 seconds. We've tried to narrow down the problem and found out that it is probably from the water pump entry. We disconnected the hose that goes into the thermostat and it still leaks but when we remove the water pump hose from the radiator it doesn't leak. We took out the water pump and it looks fine and also has a new gasket and when we pour water right into the water pump opening it comes right back out and doesn't go in, so it looks like a mystery to use but maybe someone more experienced can help us out. Mechanic's Assistant: What part of the car is the leak coming from? And are you sure it's water? Its leaking from the oil pan and we are 100% sure its water Mechanic's Assistant: What is the make/model/year of your car? Mercedes w204 C63 2009 Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far? Yes we are fixing it ourselves, we've replaced every gasket on our way to the cylinder headbolt, including the h3ad gasket and others Mechanic's Assistant: Anything else you want the Mechanic to know before I connect you? No thats it