what additive keeps engines clean by preventing contaminants and deposits from collecting on surfaces?

One additive that keeps engines clean by preventing contaminants and deposits from collecting on surfaces is MotorClean by LIQUI MOLY. This additive is added to the old oil just before it is changed, and its ingredients dissolve sludge and deposits which are then discharged together with the old oil. Other engine oil additives can also help to clean the engine, such as Amsoil, which contains a blend of cleaning agents and detergents that help to remove impurities and buildup from the engine and transmission. Additionally, some oil additives are designed to reduce friction, improve fuel economy, and clean the engine, such as those listed in the article "Best Oil Additives for High Mileage Engines: What Works and What Doesnt". It is important to choose a high-quality product that is designed for your specific engine and to follow the manufacturer's instructions carefully when using oil additives.