Be sure to check the upper radiator hose, and the heater return hose if it connects to the radiator.
The oil may float on top of the coolant...but it could back-up into both hoses depending on how the hoses are routed.
The Bus Company learned their lesson about re-purposing old containers for new contents. All that stuff has to be re-labeled so even a monkey could tell what was in the bottle.
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