What makes AMSOIL synthetic motor oils so good? The molecular uniformity and purity of synthetic oils allows them to protect and lubricate engines better and more efficiently than conventional oils in all operating conditions. Synthetics lubricate and protect quickly in cold temperatures, maintain a dependable lubricating film in normal operating temperatures and shield moving parts from damage and wear during high-stress, high-temperature operation. AMSOIL synthetic motor oils exceed the most demanding worldwide performance standards and meet warranty requirements for all domestic and imported motor vehicle engines.