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If it isn't rain water, it has to be coolant. Check the level on the coolant overflow bottle.
As noted, it could also be gas. That would mean the petcock and the carb need attention. The petcock is supposed to stop fuel flow unless there is vacuum (engine running) and the carb's float valves are supposed to stop fuel flow unless the fuel level in the floatbowls drop (running).
If you have gas in the oil, both have failed to work properly.
In any case, you need to figure out what is going on before changing the oil/filter and starting the engine.
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