When it comes to keeping the car you love safe, there’s a motor oil that offers the world-class performance you demand. AMSOIL shields your automobile with 75% more engine protection against horsepower loss and wear than required by a leading industry standard [As required by a leading industry standard. Based on independent testing of AMSOIL Signature Series 5W-30, in ASTM D7320 as required by API SN specification.], extending the life of vital components like pistons and cams

Series Synthetic Motor Oil is the top-tier AMSOIL synthetic motor oil. It is designed for motorists who want the convenience of a once-a-year oil change combined with maximum engine protection, extreme-temperature performance and fuel efficiency. Signature Series is formulated to exceed the higher performance requirements of modern engines in everything from family sedans to high-powered sports cars, providing peace of mind that your engine is well-protected, even in severe driving conditions. Its guaranteed 25,000-mile/12-month drain interval (normal service) saves you time and money, and reduces waste oil, helping the environment.