AMSOIL Applauded for Extended Drain Technology AMSOIL founder A.J. Amatuzio coined the phrase “extended drain intervals” back in 1972 with the introduction of AMSOIL 10W-40 Synthetic Motor Oil, formulated for 25,000-mile/one-year drain intervals. Not only was AMSOIL motor oil the first synthetic oil to pass American Petroleum Institute (API) service requirements, AMSOIL INC. was the only motor oil company promoting oil drains beyond 3,000 miles. Today, motorists are still bombarded with propaganda from the major oil companies promoting 3,000-mile oil changes. However, the industry is slowly but surely coming around. Vehicle manufacturers typically suggest 5,000- to 7,500-mile intervals in their […]