Engine Oil Additves Engine Cleaning AdditivesOur highly popular, long-selling engine cleaning additives use the action of a special cleaning agent to vigorously remove any sludge or varnish obstructing the flow of oil within the engine.Since no solvents are used, the engine is not damaged during cleaning. Engine Treatments These oil additives improve engine performance by creating a strong coating on metal surfaces, thereby reducing friction and abrasion between parts.Engine noise is reduced and acceleration improves, leading to a more enjoyable driving experience.