1. Cracked Cylinder Head: A cracked cylinder head can allow coolant to seep into the oil passages. This is a serious issue and will require the cylinder head to be replaced.
2. Warped Cylinder Head: If the cylinder head is warped, it can create a seal that is not watertight, allowing coolant to enter the oil passages. The cylinder head can be resurfaced to fix this issue.
3. Blown Head Gasket: Even though you have replaced the head gasket, it's possible that the new gasket was not installed correctly or has failed. Check the head gasket for proper installation and replace it if necessary.
4. Damaged Cylinder Block: A damaged cylinder block can also cause coolant to enter the oil passages. This is a rare occurrence but should be considered if none of the other solutions resolve the issue.
Additional Issues:
- Incorrect Coolant Type
- Blocked or damaged coolant passage
- Failed thermostat
- Oil cooler failure (if equipped)
To accurately identify the problem, it is recommended to consult a professional mechanic. They will be able to perform tests and inspections to determine the root cause of the issue and provide the appropriate solution.
