Wynn’s Engine Flush is a pre-oil change engine flush that internally cleans vital engine parts, removing harmful deposits, sludge and varnish that impede oil flow. Wynn’s Engine Flush is specially designed to gently dissolve and remove internal engine contaminants by suspending them in a high level of dispersants. Wynn’s Engine Flush formula provides a high degree of protection to the engine components, seals and gaskets.