AMSOIL High Performance
Synthetic 10W-40 and 20W-50 Motor Oils

• Resists high-temperature vaporization
• Resists deposit formation
• Reduces engine wear
• Reduces oil consumption and emissions
• Improves fuel economy
• Retains its viscosity for longer oil drain intervals
• Excellent low-temperature protection
• 12+ TBN ensures lasting protection against acid and soot

Superior Protection For Severe Driving Conditions

AMSOIL Synthetic 10W-40 and 20W-50 High Performance Motor Oils provide superior protection and performance in the most severe automotive driving conditions. They provide a wide range of protection in all four-cycle gasoline and diesel engines, including pickups, RVs, cars and off-highway vehicles. AMSOIL High Performance Motor Oils are recommended for use in vehicles subject to stop-and-go driving, short trips, high temperatures, frequent trailer pulling and off-road use.

Won't "Boil Off" in High Operating Temperatures

The superior high-temperature protection of AMSOIL Synthetic 10W-40 and 20W-50 High Performance Motor Oils ensures the formation of a clean, protective film of oil between working parts during high-temperature, high-stress operation. Conventional oils tend to "boil off" (vaporize) in high temperature. Vaporized oils circulate poorly, reduce fuel efficiency and contribute to excessive emissions and engine wear.
     AMSOIL High Performance Motor Oils resist vaporization. In the NOACK Volatility Test, which measures the weight loss of an oil due to evaporation, they lose only 6.9 percent and 6.0 percent of their weight, respectively, in high-temperature service, surpassing rigorous European standards set at 13 percent weight loss. Conventional oils lose up to 25 percent of their original weight! AMSOIL High Performance Motor Oils' ability to circulate efficiently keeps engine wear, oil consumption and emissions low and fuel economy high.

Resists Forming Sludge and Harmful Deposits

AMSOIL Synthetic 10W-40 and 20W-50 High Performance Motor Oils resist oil breakdown and provide maximum protection at temperatures that oxidize conventional oils. When an oil breaks down, it produces sludge and harmful deposits that contribute to corrosion, increased engine wear and decreased fuel economy. AMSOIL High Performance Motor Oils provide maximum protection and ensure clean and dependable performance in high-stress, high-temperature operations. They contain a superior detergent/dispersant additive package that, when tested after tens of thousands of miles of use in the crankcase, exhibited outstanding deposit control. The advanced heat transfer capabilities and high lubricity of AMSOIL High Performance Motor Oils keep engines running in their optimum temperature range for top performance and long life. 

Retains Their Viscosity

AMSOIL Synthetic 10W-40 and 20W-50 High Performance Motor Oils surpass the North American SAE and European ACEA oil specifications for high-temperature/high-shear (HTHS) viscosity, which means that  AMSOIL High Performance Motor Oils retain their viscosity at temperatures and loads that cause conventional oils to shear back to a lower viscosity. In the ASTM D 4683 High Temperature/High Shear Test, AMSOIL 10W-40 and 20W-50 High Performance Motor Oils significantly exceed test limits.

Superior Low-Temperature/HighTemperature Protection

During sub-zero temperatures, AMSOIL Synthetic 10W-40 and 20W-50 High Performance Motor Oils flow to all parts of the engine much quicker than conventional oils, significantly reducing the rate of wear and increasing engine life. AMSOIL Synthetic 10W-40 High Performance Motor Oil remains fluid at temperatures as low as -54°F (-48°C) and AMSOIL Synthetic 20W-50 High Performance Motor Oil remains fluid at temperatures as low as -35°F (-38°C). Their outstanding low-temperature fluidity ensures easy cranking, quick, dependable starting and fast lubrication.

Ideal for High-Stress Diesel Engines

AMSOIL Synthetic 10W-40 and 20W-50 High Performance Motor Oils' robust dispersant/detergent additive package makes them ideal for use in high-stress diesel engines. Their 12+ TBN ensures lasting protection against acid and soot in high-stress diesel applications for their entire service life.

Protects Against Rust and Corrosion

AMSOIL Synthetic 10W-40 and 20W-50 High Performance Motor Oils contains special rust and corrosion inhibitors to protect iron parts, as well as copper, lead and aluminum bearing materials.

Extended Service Life

AMSOIL Synthetic 10W-40 and 20W-50 High Performance Motor Oils feature a superior synthetic composition and advanced performance additives, performing much longer than competing petroleum and synthetic oils.

AMSOIL Synthetic 10W-40 and 20W-50 High Performance Motor Oils are recommended for extended drain intervals in unmodified, mechanically sound vehicles or equipment as follows:

Personal automotive and light truck vehicles with diesel or gasoline engines:

Normal & Severe Service: Up to 15,000 miles or one year, whichever comes first.

In motorcycles, small engines, stationary engines, heavy equipment and other applications:

Extend drain intervals based on oil analysis or follow the manufacturer recommended drain interval.

Please visit the AMSOIL Corporate website for more details on 10W-40 (AMO) or 20W-50 (ARO).

Oil Filter Service Intervals

Extended oil drain intervals are based on the user following AMSOIL recommended oil filter service intervals:

• If using an AMSOIL Ea™ Oil Filter, install a new oil filter at time of oil change. AMSOIL Ea™ Oil Filters offer a 25,000-mile or one-year service life, whichever comes first.

• If using other brands of oil filters, install a new oil filter at time of oil change then change at the engine manufacturer's recommended filter change intervals.

Note: For best performance, use AMSOIL Ea™ Oil Filters, which are designed for extended drain intervals. They stop smaller particles, allow more oil flow and last longer than regular filters.

Applications

AMSOIL Synthetic 10W-40 and 20W-50 High Performance Motor Oils are excellent for use in high-performance gasoline and diesel engines, including those under warranty, that require the use of SAE 10W-40 or SAE 20W-50 motor oil. They are recommended for applications requiring the worldwide performance specifications listed on the AMSOIL Corporate website (see "Engine Protection Requirements" below).

Engine Protection Requirements

AMSOIL Synthetic Motor Oils meet or exceed specific API, ACEA and ILSAC service classifications and the engine protection requirements of various domestic and foreign engine manufacturers. Please visit the AMSOIL Corporate website for an up-to-date listing on 10W-40 (AMO) or 20W-50 (ARO).

Attention Power Sports Enthusiasts! The AMSOIL Power Sports & Motorcycle Application Guide contains lube and filter specifications for motorcycles, snowmobiles, ATV's, personal watercraft and outboards.

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