A Core deposit is a form of deposit you pay until returning your old part. If you don't have the core at the time of purchase, you must pay the core charge. That charge is refunded to you when you return the core.
Complete Fuel System Cleanup. A concentrated one-tank cleanup that delivers a powerful SHOCK to your dirty fuel system. Made with the maximum available chemistry it's the most powerful fuel system cleaner on the market. Excellent cleanup with proven results. Up to 5.7% MPG increase, 97% total power restoration, 99% injector flow improvement and cleaner emissions. Only needed 4x per year. 1 bottle (15 fl oz) treats 25 gallons of gasoline.