He wanted me to park across the street rather than in his other designated parking spot. Why?

I’m seeing this guy and I spent the night over at his house. Before I got there he told me to park across the street rather than in his other designated parking spot for his house. I asked why (as it was late and dark) and he said that there was an oil spot in the parking spot. When I checked, there was no oil spot.

Why would he ask me to do this?
He wanted me to park across the street rather than in his other designated parking spot. Why?
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