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Oil in cooling system


1992 Carver CPMY 43 Twin Cummins diesel 300 HP
when summerizing vessel tech found oil in the cooling reservoir.
I've been wicking out the oil with bilge pads rolled up stuck into the reservoir.
Just wondering if this is possible that the cooling reservoir would have oil in it and how.
Or is it likely that the previous owner mistakenly put engine oil into the wrong location as the openings are close to each other.
Visibly the oil is not dirty "but" I had the oil changed recently as well.
This issue has me concerned but possibly just an error?
Any feedback would be appreciated.

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