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Recently my car started chugging and "vibrating" at low speeds, and the check engine light is flashing on and off. On inspection, I found oil in the coolant. I don't know a lot about cars, but a somewhat knowledgeable person I know, and this question indicate that it's a sign of the head gasket starting to go. I'd like to be sure, though.

My question is, is the problem almost certainly the head gasket, or could something else be wrong?

EDIT: The engine is a V6.

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Oil found inside the Cooling System is typically caused by leaking Intake Manifold Gaskets and sometimes the Intake Manifold itself is cracked/damaged. It is a very common issue with these vehicles. It's not a job I would recommend someone do at home unless you have the tools and experience to confidently perform the repair.

Here is an example of what the intake gasket set looks like. You didn't list engine size in your original post.

enter image description here

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