Industry Leading Synthetic Lubricants Since 1972. Amsoil offers a full line of synthetic oils and lubricants. A leader and pioneer in extended drain interval technology. Oils ranging from 7,500 - 35,000 Mile change intervals for normal service, and 7,500 to 17,500 mile changes intervals for severe service. Amsoil offers a ful line of synthetic nano fiber technology oil and air filters.