Klotz COXOC is a top-treat fuel oxygenator for pump or race gasoline. It improves engine performance, especially under low and mid-range rpm. COXOC is not designed for use with base fuels other than gasoline.
Carbureted engines may require timing and jetting adjustments when using this product. Part number: KL-614, KL-615. For nearly 60 years, racers and performance enthusiasts around the world have relied on Klotz.

For more info: https://klotzlube.com/