DEF Crystal Clean™ Diesel DEF & SCR Emissions System Cleaner 

INSTRUCTIONS: DEF Crystal Clean is specifically designed to only be installed in the Diesel Exhaust Fluid / AdBlue tank which usually has a blue cap. Do not add to the diesel fuel tank. Light Truck or Mid-Size to Large SUV 5 to 9 gallon tank capacity install full bottle into DEF tank. Car or Small SUV 3 to 5 gallon tank capacity use approximately 1/2 bottle. Medium and Heavy Duty Diesel Trucks 10 to 20 gallon tank capacity use 2 bottles. Pour DEF Crystal Clean into mostly full DEF tank or add and fill tank with diesel exhaust fluid. If light is still on after 250 miles or a few days of driving, second application may be required, or mechanical attention is needed. NOTE: Works with all approved diesel exhaust fluids. Some vehicles use a special filling adapter to install DEF / AdBlue into the tank. For those vehicles use special funnel or pour into mostly empty DEF / AdBlue bottle and install in system.