Holding ourselves to higher quality standards is our industry trademark. We select raw materials based on quality and performance, not price. Each chemical is tested to ensure it meets our quality standards before it is accepted into our manufacturing facility. Our manufacturing process uses a strictly controlled computerized process to maintain top-quality finished products. ZO: 5326620 Dealer Number Samples of the finished product are subjected to a series of industry-standard tests prior to packaging. Every product AMSOIL manufactures is tested every time it is blended to ensure maximum quality and consistency, ensuring AMSOIL customers receive the same high performance every time they purchase AMSOIL synthetic lubricants