Yellow gas caps serve as an alert, letting drivers or gas station attendants (looking at you, New Jersey) know that the vehicle's tank can be filled with E85, also known as biofuel or flex fuel.

So when you see a Coca-Cola bottle with a yellow cap, it means the drink recipe includes real sugar, not corn syrup. The yellow top indicates that the bottle is kosher for Passover.

Yellow Caps. The first reporting we found about yellow caps on Coke bottles came from an April 2, 1998, article from The Record, a newspaper based in Hackensack, New Jersey.

The yellow caps indicate that the soda is kosher, or fit, to drink on the Jewish holiday of Passover. It's made with sucrose instead of corn syrup.

Once a year, Coca-Cola releases bottles topped with yellow caps to signify that the product is Kosher for Passover. That means instead of using high-fructose corn syrup, which is forbidden for ...

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Coca-Cola bottles have a yellow cap for Passover. The typical, red-capped Coca-Cola is already kosher year-round but it contains corn syrup, which is not considered kosher for Passover.

Yellow gas caps serve as an alert, letting drivers or gas station attendants (looking at you, New Jersey) know that the vehicle's tank can be filled with E85, also known as biofuel or flex fuel.