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I bought a locking cap because I am afraid of some bad persons will pour something like wine, sand ...in the gas tank and it destroys my car. I park my car in streets, not in garage. I read in this forum horrible stories that some cars were poured beer in by bad persons.
That would be me ...car runs fine now though..had a bad coil pack along with some crappy gas in the tank (possibly some beer)...locking gas cap is a good idea.
I bought mine at Autozone and now I'm feeling secure that nobody will mess up with my stang.
You just don't know what jealous people will do these days.