AMSOIL Premium Full Synthetic 5w40 Diesel Engine Oil – API CJ-4

Exceeds Emission System Requirements – Extends the Life of Diesel Particulate Filters

AMSOIL Premium Synthetic 5w40 Diesel Engine Oil is a low-sulfated ash formulation that exceeds the modern requirements for low-emission quality diesel oil. It is compatible with all diesel exhaust treatment systems and is designed to extend the service life of diesel particulate filters (DPF).

Controls Soot Thickening and Wear

The advanced synthetic base oils in AMSOIL Premium 5w40 Diesel Engine Oil are naturally resistant to soot contamination. That, along with a heavy fortification of detergent/dispersant additives, keeps soot particles suspended independently, helping prevent the formation of larger wear causing particles. Viscosity increase is minimized and soot related diesel engine wear is controlled.

Reduces Oil Consumption and Emissions

AMSOIL Premium Synthetic 5w40 Diesel Engine Oil has lower volatility (burn-off) than conventional petroleum oils. Because less oil vapor passes into the combustion chamber, oil consumption and emissions are reduced. Additionally, lower volatility helps AMSOIL Premium 5w40 Diesel Oil retain its viscosity after high-temperature service for continued dependable protection and excellent diesel fuel economy.

Increases Diesel MPG

The advanced synthetic technology used to engineer AMSOIL Premium Full Synthetic 5w40 Diesel Engine Oil enhances viscosity properties and is proven to deliver better fuel economy. In fact, the Environmental Protection Agency’s (EPA) Federal Test Procedure confirms that AMSOIL Premium 5w40 Diesel Oil provides up to 3 percent better diesel fuel economy than conventional 15w40 diesel oils! When driving at a mix of 55 percent city/45 percent highway driving, the average improvement is 1.6 percent, and at straight highway driving the average improvement is 1.25 percent.

Diesel Oil Viscosity

Viscosity is the most critical characteristic of oil. The viscosity, or thickness, of oil directly relates to its ability to bear extreme loads and provide adequate protection for internal engine parts. Hard-working diesel engines present a serious challenge to the lubricants that protect them, generating enough force to literally tear apart, or shear, the molecular structure of the oil. Once a motor oil shears, it quickly loses viscosity, leading to accelerated equipment wear, excessive oil consumption and, ultimately, increased time and money spent on maintenance and repairs.

Because diesel fuel is a natural solvent, it quickly reduces the motor oil’s life expectancy and effectiveness. Fuel dilution leads to reduced oil viscosity, reduced oil film strength, increased engine wear (particularly in the cylinder/ring area), increased volatility, weakened lubricant detergency, accelerated lubricant oxidation, varnish formation, acid formation, corrosion and low oil pressure.

In diesel applications, a fuel dilution rate of 2 percent is abnormal and anything over 5 percent is excessive. Factors such as frequent starts, excessive idling, short trips and cold starts have contributed to moderate levels of fuel dilution in diesel applications for years, while recent issues with some modern applications have brought the fuel dilution problem to a whole new level.

For example, ASMOIL has documented increasing fuel dilution levels in 2007-2009 Caterpillar C13 and C15 on-highway engines. In addition, the diesel particular filter (DPF) regeneration process in 2007-present light duty GM, Ford and Dodge diesel pickups has also been identified as a major cause of fuel dilution. These models employ a process that includes the in-cylinder injection of raw diesel fuel on the engine’s exhaust stroke. Some of the fuel may wash directly past the rings and into the crankcase, diluting the oil. Regular washing of fuel into the oil makes it even more prone to viscosity loss and places the engine at greater risk of abnormal wear.

As shown in the graph below, even after being shear-tested for twice the industry standard and contaminated with 4 percent fuel dilution, AMSOIL maintained viscosity and was the only oil to stay within the SAE 40 viscosity rating:

AMSOIL Premium 5w40 Synthetic Diesel Oil is The Only Oil to Stay Within the SAE 40 Viscosity Rating

Oil diluted with fuel is especially prone to the effects of shearing. When combined with shearing conditions, as little as 4 percent fuel dilution is generally enough to reduce an oil’s viscosity to less than the specified viscosity grade. Considering the tough environment that diesels present to lubricating oils, AMSOIL, Inc. had the oils tested for 180 cycles, double the standard 90-cycles in the Kurt Orbahn Shear Stability Test. Samples were then contaminated with 2 and 4 percent ultra-low-sulfur diesel fuel (ULSD).

Excels in Extreme Temperatures

AMSOIL Premium Synthetic 5w40 Diesel Engine Oil resists thermal (heat) breakdown, oxidation and sludge formation better than conventional petroleum oils. And, unlike conventional oils, AMSOIL Premium 5w40 Diesel Oil contains no wax. It stays fluid in cold temperatures for improved oil flow, reduced bearing wear and easier starting.

Extended Oil Change Intervals

AMSOIL Premium 5w40 Diesel Engine Oil can extend oil change intervals far beyond those recommended for conventional petroleum oils. Its unique full synthetic formulation and long-drain additive system (10.4 TBN) deliver superior engine protection, cleanliness and performance over extended oil change intervals. AMSOIL Premium 5w40 Diesel Oil provides maximum protection for up to 3 times the OEM-recommended oil change interval, even further with oil analysis. It is recommended for extended oil drain intervals in engines that are unmodified and in good operating condition.

Diesel Engine Service: Three times (3X) OEM* recommendation, not to exceed 50,000 miles/600 hours or one year, whichever comes first, with the following exceptions. Drain intervals may be extended further with oil analysis.

• 2007 – 2009 Caterpillar C13 and C15 on-highway engines must follow OEM drain interval
• 2007 – Present Dodge, Ford and GM light duty diesel pickups must follow OEM-recommended drain interval. Drain intervals may be extended with oil analysis.

Gasoline Engine Service: Two times (2X) OEM* recommendation, not to exceed 15,000 miles or one year, whichever comes first.

*Original Equipment Manufacturer. Operating conditions and oil drain intervals for normal and severe service are defined by the OEM. Refer to your owner’s manual.

Note: extended oil drain intervals are not recommended when using biofuels containing >10% ethanol or 5% biodiesel (B5). Follow OEM drain intervals or extend drain intervals with oil analysis.

Oil Filter Service Intervals

Extended oil change intervals are based on the user following AMSOIL recommended oil filter service intervals. Install a new oil filter at time of oil change.

• AMSOIL Ea Oil Filters and Donaldson Endurance Oil Filters are full flow oil filters designed for extended oil drain intervals. They stop smaller particles, have less restriction and last longer than regular oil filters. For best performance, use AMSOIL Ea or Donaldson Endurance oil filters. If using other brands of oil filters, install a new oil filter at time of oil change then change at the OEM’s (original engine manufacturer) recommended filter change intervals.
• For maximum engine and oil life, AMSOIL Ea Bypass Oil Filters are specialized for the removal of small, wear-causing dirt particles. These filters are placed outside the main line of oil circulation, using an AMSOIL Bypass Oil Filtration System mount.
• Please visit our Oil Filter page to see all of these products and more.

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 Synthetic 5w40 Diesel Engine Oil (DEO) is recommended for diesel engines and, where appropriate, gasoline engines requiring any of the following specifications:

• SAE 5w40
• API Licensed CJ-4, CI-4+, CF, SN, SM
• ACEA E7, E9
• Mack EO-O
• DDC 93K218
• Caterpillar ECF-3, ECF-2, ECF-1-a
• Cummins 20081
• Volvo VDS-4, VDS-3
• MS 10902
• MB 228.31
• MTU Type I & II, Type 2.1
• MAN 3275, 3575
• JASO DH-2
• Global DHD-1
• Renault RLD-3
• Ford WSS-M2C171E

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Return Policy

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