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AMSOIL FORMULATES A WIDE SELECTION OF SYNTHETIC LUBRICATING OILS for all types of engine and gear applications, including those for specialized vehicles and severe operating conditions. In addition, AMSOIL has developed sophisticated fuel additives, filtration systems and other companion products that supplement and extend lubricant performance. This complete line of quality products is recognized by countless private motorists, fleet managers and industrial administrators as the best and most cost-effective choice for increasing engine performance, reducing maintenance and prolonging vehicle and equipment life.
AMSOIL synthetic motor oils may be used for 25,000 miles or one year under normal service conditions.
So, what is it that allows AMSOIL motor oils to be used for extended drain intervals, while other oils must be changed significantly sooner? First, the synthetic base stocks with which AMSOIL motor oils are formulated are worlds apart in quality compared with conventional base stocks. The synthetic molecules are uniform in size and shape, resisting the vaporization that boils off the smaller molecules of conventional motor oils and leaves behind a thicker, higher viscosity oil that compromises engine protection. AMSOIL motor oils surpass even the most stringent European volatility standards, providing superior protection for extended drain intervals.
Second, AMSOIL spares no expense when it comes to additives, selecting the most robust additive packages on the market. These additives keep AMSOIL motor oils shear stable, resist the degrading effects of varnish and sludge, keep engine components clean and deposit-free and effectively resist rust, corrosion and foaming.
By using only the highest quality synthetic base stocks and additives available, AMSOIL motor oils are capable of extended drain intervals, all while maintaining performance, providing long-term wear protection and fuel economy, keeping engines clean and deposit-free, providing cold weather starts and protecting against rust and corrosion.

AMSOIL has a documented history of leadership and innovation
- First to develop an API-rated 100 percent synthetic motor oil (1972).
- First U.S. company to utilize the NOACK volatility test as a standard of performance.
- First to produce synthetic motor oils for diesel engines, racing, turbo and marine engines.
- First to introduce synthetic oils that legitimately contribute to improving fuel efficiency.
- First to manufacture synthetic gear lube for automotive use.
- First to manufacture a 100:1 pre-mix synthetic 2-cycle oil.
- First to manufacture a synthetic automatic transmission fluid (ATF) for automotive use.
- First to introduce "nanotechnology" in filtration for auto/light trucks.
- First to introduce full synthetic media in a diesel cartridge filter.
- First to introduce the concept of "extended drain intervals" with a recommended 25,000-mile or 1-year drain interval (1972).

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