Agree with GREEN. Definitely doesn't look (or act) like fuel. Fuel would puddle but evaporate fairly quickly; wrong area for coolant. Ditto for getting parts off that may prevent adequate viewing of the source, but if you can afford to bite the bullet, pro service is probably the best recourse! Good luck. Hope you can find the 'wound' and stop the bleeding! Hopefully your oil is not over-filled and that the screw cap is secured properly.
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