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Coolant leaking into oil

Tiny
BLAKERS
  • MEMBER
  • 2002 GMC SAFARI
  • 4.3L
  • V6
  • 2WD
  • AUTOMATIC
  • 250,000 MILES
We were driving back from another town when the engine shut down involuntarily, we took it to a mechanic and he showed me a bottle of milky white substance. According to my wife a little bit of smoke was coming out of the hood immediately after engine shut off.
I'm wondering if it would for sure be a head gasket or maybe something else?
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Friday, October 16th, 2020 AT 12:35 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Normally if you have coolant in the oil then you have a head gasket issue. However, there are other causes depending on if this is engine oil or transmission oil.

The way to confirm a head gasket is they need to perform this test.

https://www.2carpros.com/articles/head-gasket-blown-test

Here is a guide that will help with some of the other causes:

https://www.2carpros.com/articles/coolantantifreeze-in-the-engine-oil

I would suggest they prove out that this is a head gasket before proceeding but it is a good bet that this is what it is. Let us know what happens. Thanks
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Friday, October 16th, 2020 AT 3:39 PM

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