12-Ounce bottle Mercury Quickleen Fuel Treatment.

A deep-cleaning, periodical treatment, the Mercury Quickleen Engine & Fuel System Cleaner quickly and thoroughly removes carbon deposits from carburetors, injectors, intake valves, spark plugs, piston crowns, and cylinder heads. Working to extend spark plug life, while preventing engine knocking, and piston seize-up, the Mercury Quickleen Engine & Fuel System Cleaner is designed to keep fuel systems clean and engines running at their absolute best. 1 ounce treats 5 gallons - 12 ounce bottle treats 60 gallons.