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.
CRC Motor Treatment
16 oz Oil System Cleaning Kit
Cleans gum, varnish and carbon from the fuel system, injectors, pistons, and combustion chamber. Removes moisture from fuel and oil systems and lubricates engine components. For use in gasoline, diesel, ethanol and oil. Pour into fuel system, induce directly into combustion chamber via main manifold vacuum line and add to crankcase.