oil is mixing into coolant water

Question

i have an opel astra twintop 1.6 2009. oil is mixing into coolant system. there is oil in expantion tank. almost all the oil goes into expantion tank. Can you show me the way how to solve it? we changed oil cooler but problem still exist. Same thing happened again.  Now water is not circulating too. may be oil blocked circulation way of water? last thing we tried we blocked water passing way inside oil cooler. so that no water enters into oil cooler. again i saw oil inside expantion tank. i want to be sure if it is new or old.

Salvador Martinez · Answer

The only place where oil and coolant can mix is in the engine itself. So as Dave said, either you have a bad head gasket or a cracked engine head. Check the oil to see if there's coolant in there. You can tell because the oil will be a coffee brown milky color.

Answered by Salvador Martinez on August 8, 2021

Mehmet Gökşin · Answer

i found the problem and it is solved. problem was  not head gasket. it was oil pump gasket. 
oilpump gasket is separating oil and water from each other.  previously oil and water mix happened in the past. previously it was oil collant. because in oil collant oil pass inside it and from other side water pass. oil collant had 4 holes. 2 enterance 2 exit. from 1. enterance water comes in from 2. enterance oil goes in. 1. exit is water 2. one is for oil. but problem was not oil collant. it was oil pump gasket.

oil is mixing into coolant water

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