Just 5 minutes prior to oil change add Penray Motor Flush to dissolve the sticky and gummy deposits formed by internal combustion. These deposits cling to vital engine parts inside the engine even after an oil and filter change. After using Penray Motor Flush engine oil will circulate freely to all parts of the engine, freeing sticky valves and rings. (Add Motor Flush to dirty oil, run engine for 5 minutes, continue with maintenance oil and filter change.)