Use at each oil change. Run the engine at idle for 5 minutes to warm the engine. Remove the oil filler cap and pour one bottle of NoSmoke® into the crankcase. Do not overfill. If smoking occurs between oil changes, maintain the engine by adding a sufficient amount of NoSmoke® to control emissions. Caution: Only add this product to an engine that is running at its normal operating temperature. Dispose of any used or unused solution in accordance with the local, state and federal regulations.