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What could be the possible cause of oil leaking into the radiator when the engine is running?

I have changed the O-rings on the oil cooler and pressure tested the cooler.

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    How's the head gasket?
    – Zaid
    Commented Aug 24, 2015 at 14:11

1 Answer 1

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The oil cooler is one possible place where oil and coolant could mix, but there are other culprits:

  • a compromised head gasket can allow oil to mix into the cylinder head's cooling jacket

  • a warped cylinder head can do the same.

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