Pro Line Engine Flush is a highly effective detergent additive used to clean the interior of an engine before an oil change. It removes deposits and residues from all 4-stroke gasoline engines and diesel engines. The product dissolves sludge and lacquer, isolating solid particles and liquid contaminants. It improves the combustion process and restores full engine performance, while also preventing corrosion of unprotected metal surfaces. It helps recover the oil's lubricating properties. To use, add the product to the engine oil before the oil change, run the engine at idle speed for 10 minutes, then drain the oil, change the oil filter, and refill with fresh engine oil. The product is fully compatible with all commercially available engine oils.