black substance in coolant overflow.
 

my parents accord recently had a black substance (looks like oil) in
their coolant over flow in their 99 2.3L accord ex. just wondering if
there was a history of bad head gaskets on these cars, or if maybe
there is a transmission oil cooler in the radiator that could have
caused the mix.
Any help would be greatly appreciated.

Car is an Automatic with 160k on the odometer.

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