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2013 Chevrolet Cruze oil in the coolant reservoir

Oil in the coolant reservoir why?

Bad head gasket and/or warped head and/or cracked block and/or someone dumped oil in radiator.

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That might not be oil but instead transmission fluid.

There’s a transmission fluid cooler inside the radiator. If this cooler springs a leak, transmission fluid will contaminate the cooling system.

If possible, check the transmission fluid for proper level/coolant contamination.

Tester

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Traverse City?

CSA
:palm_tree::sunglasses::palm_tree:

Yes.:fearful::snowflake:. And lovin it