There are several complaints about Amsoil products and their customer service. A 2014 Amazon review criticizes Amsoil oil as pricey and claims it is not 100 percent synthetic. A 2012 review states the oil is no different than other synthetic oils on the market.
As of 2016, the majority of Amsoil reviews are positive. Amsoil Incorporated was established in 1972 and specializes in the production of synthetic lubricants to aid vehicles and other equipment. The products are manufactured and packaged in the United Sates.
The lubricants are used in several markets, including automotive, industrial and racing. Amsoil 10W-40 synthetic motor oil was the first synthetic oil to meet the American Petroleum Institutes' service requirements.