Why do my cat neighbours sniff my car?

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Cats exhibit some really strange behaviour at times. I've mentioned in a previous post that there's a cat that lives up the road from me who sometimes likes to come into my house, and even sleep here overnight. I don't mind, she's well-behaved and I like cats. But there's an odd thing she's done several times now. When I arrive home from work in my car, just after I've switched off the engine, she comes up to the front of the car and sniffs at the radiator grill. She did this today, and she even licked it two or three times. Then her sister came over and did the same thing? Why? What attaction has the smell and taste of a car got for cats? Completely baffling.