I agree that it’s not ok when a car is leaking oil. I would absoulutely write this in the House Rules. I am not sure if Airbnb would axcept this kind of damage, and they are absolutely not paying for damages done by friends of your guests… Many hosts do not allow the guests having friends over, because this can cause problems. Even if this is ok. for you, you should consider to not allow any parking in the driveway from others then the guests you are hosting.
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