I am not sure of this but I have always been told that the ‘Plastic lug nut covers’ will keep the actual lug nuts from getting quite rusty. If you are stopped by DOT, rusty lug nuts can be an offense and a ticket with a fine can be issued. Real pricks will make you stop and go get new lug nuts. Most are too lazy to pull more than a couple of the plastic covers so you can get away with some not so perfect lug nuts for a longer period of time.
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