Anceaux 5W-30 fully synthetic lubricating oil (ASL signature series) is produced with diester (Grade 5) base oil and additives specially developed by AMSOIL Company. Anceaux 5W-30 long-acting synthetic lubricating oil (ASL) provides special lubrication protection for all conventional gasoline engines. Reduce friction, heat and wear, and provide maximum power output; Improve engine performance and fuel economy; Keep the engine clean, effectively reduce the pollution of sludge and paint film, and make the engine bear higher temperature tolerance. Provide more lasting protection for the engine, suitable for all-weather use.