oil leaking into my coolant system

Asked by Jul 01, 2017 at 01:38 AM about the 2002 Saturn S-Series 4 Dr SL2 Sedan

Question type: Maintenance & Repair

I'm trying to figure out the most common
reason for oil leaking into the coolant
system of my 2002 SL2 Saturn

5 Answers


Damaged head gasket

Not a cracked block or head? Or the il cooling lines leaking in the cooling system?


The most common is a blown headgasket, you won't know if the head is cracked until it is torn down and the head pressure tested, cracked blocks are rare unless it froze sometime in its life.


See if your engine oil cooler is in the radiator. May be leaking but may be gaskets like said above, and pressure check is done with head off but year could be cracked but I doubt it.


Could it be auto transmission fluid leaking into the radiator? If so, the radiator needs to be replaced ans the transmission needs to be checked for coolant contamination.

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