I don't mean ship it from other planets. I said that to illustrate this point: despite what we are told, it is a natural mineral made by the immense activity and chemical reactions in the earth's mantle, and not purely from fossilsed dead things which will expire. The fact that it could be on other planets merely says that it's a universal process of any planet with a molten hot core.
So basically, because nobody really knows for sure how petrol and oil are made, the oil companies who say 'we have 50 years' worth down there' could quite possibly be lying to us to drive their prices up and have loads more than they say because it isn't made from ancient organic matter and actually from carbon deposits dating back from the formation of the earth itself.
The evidence of biology in oil could just be down to the thermophiliac (heat-seeking) bacteria that live near the bottom of the earth's crust.
You should never rule this stuff out, especially when we don't know enough.