Gas additives can be found at auto parts stores, such as Auto Zone and O'Reilly Auto Parts. Customers can also browse the companies' websites for gas additives offered by each store. In addition, Auto Zone's website shows customer ratings for its gas additives listed.
Auto Zone offers a wide selection of gas additives both inside its stores and online. Besides viewing customer ratings for each item, customers can also browse and compare items on their website.
O'Reilly Auto Parts also offers a wide selection of additives both inside its stores and online. Customers can check the availability of a particular item at a local store by entering a ZIP code.