Restore Engine Restorer & Lubricant is a high performance oil additive that increases compression in older high-mileage engines. The unique CSL formula fills worn areas of the cylinder walls to reduce blow-by and restore compression to near original levels. Restoring cylinder compression improves combustion to increase horsepower, reduce oil burning, maximize fuel mileage and restore peak engine performance. In addition, it provides extreme pressure lubrication to help protect engine components from excessive wear. Compatible with conventional or synthetic oil.