AMSOIL Premium Protection Synthetic Engine Oils – 10w40 and 20w50

Superior Oil for Severe Driving Conditions and High-Mileage Cars

AMSOIL Premium Protection Full Synthetic 10w40 and 20w50 Engine Oils are specially formulated to provide superior protection and performance in a wide variety of demanding applications. By incorporating high-quality synthetic base stocks and a superior high-zinc additive package, AMSOIL Premium Protection Engine Oils exceed the needs of large and small gasoline and diesel engines in cars, trucks, motorcycles, RVs, hot rods, marine, maintenance equipment and heavy equipment. They are the ideal oil for high-mileage cars, vehicles with flat tappet cams and high-stress vehicles subject to hot temperatures, heavy hauling, trailer pulling or off-road use.

High Zinc and Phosphorous ZDDP Motor Oil for Flat Tappet Camshaft Engines

To preserve catalytic converter life in newer vehicles, phosphorus levels in motor oil have been reduced. Concerns have risen that oils containing lower levels of zinc and phosphorus could provide insufficient protection in high-pressure areas of flat tappets and camshaft lobes found in many older and high-performance engines. Flat tappet camshafts undergo extreme pressure and loads, thus requiring an engine oil that is fortified with anti-wear additives to provide premium protection. The severity of higher spring pressure in racing engines also creates the need for additional wear protection.

The most commonly used anti-wear additive in motor oils is zinc dialkyldithiophosphate, or ZDDP. ZDDP contains both zinc and phosphorus components working together to provide anti-wear protection, and is most important during cam break-in procedures. Proper break-in oil should be used during the break-in phase for all new or rebuilt engines with flat tappets. These lubes provide the extra protection required to reduce wear at the point of contact during break-in and help the flat tappet face properly mate with the cam lobe. Once the break-in phase is completed, AMSOIL motor oils, which are formulated with high levels of zinc and phosphorus, will provide premium protection to flat tappet cams.

All engines, especially high-performance modified engines, benefit from oils with superior film strength and anti-wear properties. The flat tappet-camshaft lobe interface is the one area in an engine that has extreme contact load. Since this load increases significantly when non-stock, high-pressure valve springs are employed, the use of properly formulated motor oils is extremely important to reduce wear and extend flat tappet-camshaft life. For best protection, AMSOIL recommends motor oils containing high levels of zinc and phosphorus. Visit our High ZDDP Motor Oil page to see a list of which AMSOIL Synthetic motor oils contain high levels of zinc and phosphorus and their amounts.

High-Viscosity Oil for Long Engine Life

AMSOIL Premium Protection Synthetic 10w40 and 20w50 Engine Oils are high viscosity oils engineered to protect against metal-to-metal contact. They resists viscosity shear and are formulated with a heavy treatment of zinc and other anti-wear additives for excellent protection of gears, bearings, cam lobes and other high-pressure components in engines and transmissions. AMSOIL Premium Protection Engine Oils help extend engine life.

Wet Clutch Oil

AMSOIL Premium Protection Synthetic 10w40 and 20w50 Engine Oils exceed the requirements of wet clutch transmissions and reduce clutch wear for extended transmission life. They contain no friction modifiers, making them ideal for motorcycles, maintenance equipment and other wet clutch transmission applications. Formulated to prevent clutch glazing and slippage, AMSOIL Premium Protection Engine Oils help insure smooth clutch engagement and long term, dependable transmission operation.

High-Temperature Oil

The superior high-temperature protection of AMSOIL Premium Protection Synthetic 10w40 and 20w50 Engine 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 Premium Protection Engine Oils resist vaporization – in the NOACK Volatility Test, which measures the weight loss of an oil due to evaporation, they lose only 6.7 percent of their weight in high-temperature service, surpassing rigorous European standards set at 13 percent weight loss!

AMSOIL Premium Protection Synthetic Engine Oils are specifically formulated to overcome the thermal deficiencies common to conventional petroleum oils. Volatilization (burn-off), oxidation and excessive deposit formation from high heat are greatly reduced. Viscosity thickening is controlled and engines run cleaner, promoting cooler operation and long engine life in air- or liquid-cooled engines. In addition, the higher viscosity nature of AMSOIL Premium Protection 20w50 Engine Oil may help reduce oil consumption in equipment that experiences higher-than-normal usage rates when lower-viscosity lubricants are installed.

Cold-Weather Oil

During sub-zero temperatures, AMSOIL Premium Protection Synthetic 10w40 and 20w50 Engine Oils flow to all parts of the engine much quicker than conventional oils, significantly reducing the rate of wear and increasing engine life. In the Pour Point Test, which determines the lowest temperature at which an oil flows, AMSOIL Premium Protection Engine Oils remain fluid at temperatures as low as -47°F and -33°F, respectively. Their outstanding low-temperature fluidity ensures easy cranking, quick, dependable cold-weather starts and fast lubrication.

High TBN Controls Engine Deposits

AMSOIL Premium Protection Synthetic 10w40 and 20w50 Engine Oils 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. This robust dispersant/detergent additive package makes them ideal for use in high-stress diesel engines – their high TBN (12+ Total Base Number) ensures lasting protection against acid and soot for their entire service life.

Protects Against Rust and Corrosion

AMSOIL Premium Protection Synthetic 10w40 and 20w50 Engine Oils contains special rust and corrosion inhibitors to protect iron parts, as well as copper, lead and aluminum bearing materials.

Extended Oil Change Intervals in Gasoline and Diesel Engines

The superior AMSOIL synthetic base stock and additive technology in AMSOIL Premium Protection Engine Oils exceed the requirements of both gasoline and diesel engines. They are designed to neutralize acids, disperse soot and last longer in service than conventional oils.

AMSOIL Premium Protection Synthetic 10w40 and 20w50 Engine Oils are recommended for extended oil change intervals in unmodified, mechanically sound vehicles or equipment as follows:

Diesel Engines:

Normal Service: Up to 25,000 miles or one year, whichever comes first, or longer based on oil analysis*.

Severe Service: Up to 15,000 miles or one year, whichever comes first, or longer based on oil analysis*.

Gasoline Engines:

Normal and Severe Service: Up to 15,000 miles or one year, whichever comes first, or longer based on oil analysis*.

Motorcycles, Small Engines, Stationary Engines, Heavy Equipment and Other Applications: Extend drain intervals based on oil analysis* or follow the manufacturer-recommended drain interval.

*Oil Analyzers, Inc., a division of AMSOIL, provides cost-effective, quality oil analysis services.

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 Filters, install a new oil filter at time of oil change. AMSOIL Ea Oil Filters are designed for extended oil drain intervals. They stop smaller particles, allow more oil flow and last longer than regular filters.
• 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.

Good to Know

• For best results, use AMSOIL Engine and Transmission Flush before installing AMSOIL synthetic motor oil.
• For maximum engine protection, use an AMSOIL Ea Extended Life Oil Filter.
• AMSOIL recommends checking the oil at a minimum of every 3,000 miles to maintain proper fill levels and maximum engine protection.
• Oil Analyzers, Inc., a division of AMSOIL, Inc., provides cost effective, quality oil analysis services.
• Most quick lube service centers will install these products upon request or you can install them yourself.

Applications

AMSOIL Premium Protection Synthetic 10w40 and 20w50 Engine Oils are a multi-use, premium synthetic lubricant for applications that require or benefit from a higher viscosity oil. They are recommended for use in air- and liquid-cooled, large or small gasoline and diesel engines, transmissions and chain case applications that require the use of 10w40 or 20w50 motor oil and any of the following performance specifications:

AMSOIL Premium Protection Full Synthetic 10w40 Engine Oil (AMO):

• API SL, SJ, SH, SG
• API CI-4+, CI-4, CH-4, CF, CF-2
• ISO-L-EMA
• Caterpillar ECF-1
• JASO MA (Motorcycle)
• MAN 271/3275
• MTU Type 2
• Cummins 20071/20072/20076/20077
• Volvo, VDS-2, VDS
• Mack EO-M+, EO-M
• ACEA A3/B3, E3, E5
• MB 228.1, 228.3, 229.1
• Detroit Diesel 93K214

AMSOIL Premium Protection Full Synthetic 20w50 Engine Oil (ARO):

• API SL, SJ, SH, SG
• API CI-4+, CI-4, CH-4, CF, CF-2
• ISO-L-EMA
• Caterpillar ECF-1
• JASO MA (Motorcycle)
• MAN 271/3275
• MTU Type 2
• Cummins 20071/20072/20076/20077
• Volvo, VDS-2, VDS
• Mack EO-M+, EO-M
• ACEA A3/B3, E3, E5
• MB 228.1, 228.3, 229.1
• Detroit Diesel 93K214

Shipping for Online and Catalog Customers

Online and catalog customers receive FREE standard ground shipping on orders of $100 or more when shipped to a valid address in the continental United States, including APO and FPO military post boxes. AMSOIL does not ship to PO Boxes. The $100 minimum does not include taxes, fees or other charges. For online and catalog retail orders totaling less than $100, a flat shipping rate of $8.50 will apply in the continental U.S.

Please Note: AMSOIL Dealers and Preferred Customers are not eligible for free shipping. Orders containing only clothing and promotional materials totaling less than $20 are subject to $5 shipping and handling.

For more information, please visit the AMSOIL, Inc. website: AMSOIL Shipping, Sales Tax and Product Return Guidelines

Return Policy

Please visit the AMSOIL, Inc. website: AMSOIL Shipping, Sales Tax and Product Return Guidelines