4 oz, Ethanol Shield, for 2 cycle engine use, protects your entire fuel system from the harmful effects of ethanol blended fuel & cleans varnish & carbon deposits from the fuel tank to the tailpipe, treats the problem not the symptom, preventative maintenance formula, removes water, prevents ethanol phase separation, contains rubber & plastic conditioners, increases octane, fuel stabilization, upper cylinder lubrication, reduces emissions, synthetic fuel additive, safe for 2 cycle engine.