AMSOIL Shipping Information
Online StoreAMSOIL Preferred Customer ProgramAMSOIL Business AccountsAMSOIL Dealership OpportunityOrder FREE AMSOIL Product CatalogContact Us
Email Price List
  • AMSOIL synthetic lubricants for diesel trucks
  • AMSOIL synthetic lubricants for heavy duty diesel equipment

Top Protection for Diesel Trucks and Heavy Duty Diesel Equipment

Why AMSOIL? | Both products exceed the latest API CK-4 specification. Heavy-Duty Synthetic Diesel Oil keeps equipment protected with 4 times better wear protection than rquired by the Detroit Diesel DD13 scuffing test. For even greater protection, Signature Series Max-Duty Synthetic Diesel Oil provides 6 times more wear protection than required by the test. Signature Series is engineered for hardcare enthusiasts and fleet owners interested in the best oil for their deisel engines, with reserve protection that allows them to extend their drain intervals.

Engine Protection

A diesel truck is a serious investment – don’t skimp on protection. AMSOIL synthetic diesel oils provide the ultimate protection for your hard-working diesel engine, preserving the horsepower you crave and keeping you on the road.

Turbocharged Protection

The extreme heat produced by turbochargers can be brutal on your oil. If your oil fails and your turbos are damaged, you start losing horsepower – or worse. Our synthetic diesel oils are designed to protect your horsepower. We build extra turbo protection into every drop, preserving turbos and delivering reliable horsepower.

Click here to see why Maximum Viscosity Protection is so important

Maintain Viscosity Under Shearing Forces

research amsoil synthetics

Hard-working diesel engines present a serious challenge to the lubricants that protect them. Tight clearances and intense pressures can generate enough force to tear apart the molecular structure of the oil, causing permanent viscosity loss. Permanent viscosity loss is termed “shear” and leads to accelerated equipment wear, oil consumption and deposit formation.

Shear stability measures a lubricant’s ability to withstand shearing forces without degrading to a lower viscosity. To meet CJ-4 requirements for shear stability, the American Petroleum Institute (API) requires diesel oils to pass the Kurt Orbahn 90-Cycle Shear Stability Test.

Maintain Viscosity Under Fuel Dilution

Resisting shear and maintaining protective viscosity in the harsh operating conditions of diesel engines is challenge enough for many diesel oils, but maintaining viscosity in the face of fuel dilution is another challenge altogether. Factors such as frequent starts, excessive engine idling, short trips and cold weather have contributed to moderate levels of fuel dilution in diesel applications for years, while recent issues with emission systems have brought the fuel dilution problem to a whole new level.

For example, AMSOIL has documented increasing fuel dilution levels in 2007-2009 Caterpillar C13 and C15 on-highway engines. There are many possible causes, including problems with a unit injector or leaking seals. Another cause of fuel dilution is new emission systems using in-cylinder post-fuel injection, a process most 2007-present light-duty GM, Ford and Dodge diesel pickups use to regenerate the diesel particulate filter.

Because diesel fuel is a natural solvent, it causes a multitude of problems when it contaminates the oil, including 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.

The most notable problem associated with increased fuel contamination is reduced viscosity and the corresponding effect it has on oil performance. 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.

AMSOIL Maintains Viscosity Under 4 Percent Fuel Dilution

AMSOIL sent five competitive synthetic CJ-4 5W-40 diesel oils to an independent laboratory for shear stability testing. Knowing the tough environment that diesels present to lubricating oils, AMSOIL doubled the standard Kurt Orbahn 90-cycle test and had the oils tested for 180 cycles. Samples were then contaminated with 2 and 4 percent ultra-low sulfur diesel (ULSD) fuel. As the graph shows, 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 an SAE 40 viscosity rating. As other oils lost viscosity due to shearing forces and fuel dilution, their ability to protect against wear was jeopardized.

AMSOIL Premium Synthetic Diesel Oils are formulated with an ultra-shear-stable polymer system that maintains viscosity better than inferior products. Testing proves that AMSOIL provides unsurpassed shear stability, offering better viscosity control than competitive oils.

Even though recent fuel dilution issues forced AMSOIL to adjust its Premium API CJ-4 Synthetic Diesel Oil drain interval recommendations in 2007-present Dodge, Ford and GM LMM light-duty turbo-diesel pickups and 2007-2009 on-highway Caterpillar C13 and C15 engines to the manufacturer-recommended drain intervals, AMSOIL Premium Synthetic Diesel Oils remain the premium choice for diesel applications. AMSOIL Premium Synthetic Diesel Oils resist viscosity loss from both shearing forces and fuel dilution to maintain their protective film strengths, providing superior protection to all diesel engines.

AMSOIL Signature Series Max-Duty Synthetic Diesel Oil

AMSOIL Signature Series Max-Duty Synthetic 0W-40 Diesel OilMax-DutySynthetic 0W-40 Diesel Oil
AMSOIL Signature Series Max-Duty Synthetic 5W-30 Diesel OilMax-DutySynthetic 5W-30 Diesel Oil
AMSOIL Signature Series Max-Duty Synthetic 10W-30 Diesel OilMax-DutySynthetic 10W-30 Diesel Oil
AMSOIL Signature Series Max-Duty Synthetic 5W-40 Diesel OilMax-DutySynthetic 5W-40 Diesel Oil
AMSOIL Signature Series Max-Duty Synthetic 15W-40 Diesel Oil Max-DutySynthetic 15W-40 Diesel Oil

AMSOIL Heavy-Duty Synthetic Diesel Oil

AMSOIL Heavy-Duty Synthetic CK-4 Diesel Oil 10W-30Heavy-DutySynthetic 10W-30 Diesel Oil
AMSOIL Heavy-Duty Synthetic CK-4 Diesel Oil 5W-40Heavy-DutySynthetic 5W-40 Diesel Oil
AMSOIL Heavy-Duty Synthetic CK-4 Diesel Oil 15W-40Heavy-DutySynthetic 15W-40 Diesel Oil
AMSOIL DOMINATOR 20W-50 Competition Diesel OilAMSOIL DOMINATOR 20W-50Competition Diesel Oil

Two-Million Mile Trucker

AMSOIL synthetic lubricants won’t let two-million mile trucker retire.

...read the full story

Diesel Performance Tests

AMSOIL Diesel Fleet Fuel Economy Study in Stop-and-Go City ConditionsDiesel Fleet Fuel EconomyStudy in Stop-and-Go Conditions
AMSOIL Premium API CJ-4 5W-40 Synthetic Diesel Oil (DEO) Shear StabilityAMSOIL Premium API CJ-45W-40 Synthetic Diesel OilShear Stability
AMSOIL increases fuel economy by 6.54 percent in short- to medium-haul diesel applicationsDiesel Fleet Fuel Economyshort- to medium-haul dieselincrease fuel economy by 6.54 percent
Complete list of AMSOIL Performance TestingAMSOIL Performance Studies

AMSOIL CI-4 Diesel Oil

AMSOIL Series 3000 SAE 5W-30 Synthetic Heavy Duty Diesel OilSeries 3000 SAE 5W-30Synthetic Heavy Duty Diesel Oil
AMSOIL SAE 15W-40 Heavy-Duty Diesel and Marine Motor Oil SAE 15W-40 Heavy-DutyDiesel and Marine Motor Oil

AMSOIL Automatic Transmission Fluids

AMSOIL Signature Series Multi-Vehicle Synthetic Automatic Transmission FluidSignature Series Multi-VehicleAutomatic Transmission Fluid
AMSOIL Signature Series Fuel-Efficient Synthetic Automatic Transmission FluidSignature Series Fuel-EfficientAutomatic Transmission Fluid
AMSOIL OE Multi-Vehicle Synthetic Automatic Transmission FluidOE Multi-Vehicle SyntheticAutomatic Transmission Fluid
OE Fuel-Efficient Synthetic Automatic Transmission FluidOE Fuel-Efficient SyntheticAutomatic Transmission Fluid
Torque-Drive® Synthetic Automatic Transmission FluidTorque-Drive® SyntheticAutomatic Transmission Fluid

AMSOIL Manual Transmission Fluids

AMSOIL Synthetic Powershift Transmission Fluid SAE 10WSynthetic PowershiftTransmission Fluid SAE 10W
AMSOIL Synthetic Powershift Transmission Fluid SAE 30Synthetic PowershiftTransmission Fluid SAE 30
AMSOIL Synthetic Powershift Transmission Fluid SAE 50Synthetic PowershiftTransmission Fluid SAE 50
SAE 50 Long-Life Synthetic Transmission OilSAE 50 Long-LifeSynthetic Transmission Oil

AMSOIL Synthetic Gear Lubes

AMSOIL 75W-90 Long Life Synthetic Gear Lube75W-90 Long Life SyntheticGear Lube
AMSOIL 80W-140 Long Life Synthetic Gear Lube80W-140 Long Life SyntheticGear Lube
AMSOIL Severe Gear® 75W-90Severe Gear® 75W-90
AMSOIL Severe Gear® 75W-110Severe Gear® 75W-110
AMSOIL Severe Gear® 75W-140Severe Gear® 75W-140
AMSOIL Severe Gear® 80W-90Severe Gear® 80W-90

AMSOIL Synthetic Greases

AMSOIL Synthetic Polymeric Truck, Chassis and Equipment Grease, NLGI #1Synthetic Polymeric Truck,Chassis and Equipment Grease,NLGI #1
AMSOIL Synthetic Polymeric Truck, Chassis and Equipment Grease, NLGI #2Synthetic Polymeric Truck,Chassis and Equipment Grease,NLGI #2
AMSOIL Synthetic Multi-Purpose Grease NLGI #2Synthetic Multi-Purpose GreaseNLGI #2
AMSOIL Synthetic Fifth-Wheel GreaseSynthetic Fifth-Wheel Grease
AMSOIL Arctic Synthetic GreaseArctic Synthetic Grease
AMSOIL Synthetic Polymeric Off-Road Grease, NLGI #1Synthetic Polymeric Off-Road Grease, NLGI #1
AMSOIL Synthetic Polymeric Off-Road Grease, NLGI #2Synthetic Polymeric Off-Road Grease, NLGI #2
AMSOIL Semi-Fluid 00 Synthetic EP GreaseSemi-Fluid 00Synthetic EP GreaseFor Truck Wheel Hubs

AMSOIL Filtration & By-Pass Filtration

Donaldson Blue Oil FiltersDonaldson Blue Oil Filters
Donaldson Blue Heavy Duty Air FiltersDonaldson Blue Heavy DutyAir Filters
AMSOIL Ea Heavy-Duty Extended-Life Oil FiltersAMSOIL Heavy-Duty Extended-Life Oil Filters
AMSOIL Ea® Bypass Oil FilterEa® Bypass Oil Filter
AMSOIL Heavy-Duty Bypass SystemHeavy-Duty Oil Bypass System

AMSOIL filter lookup for semi-trailer and trucking applications

AMSOIL Diesel Fuel Treatments

AMSOIL Diesel All-In-OneDiesel All-In-One
AMSOIL Diesel Injector CleanDiesel Injector Clean
AMSOIL Diesel Cold FlowDiesel Cold Flow
AMSOIL Diesel Injector Clean + Cetane BoostDiesel Injector Clean + Cetane Boost
AMSOIL Diesel Recovery Emergency Fuel TreatmentDiesel Recovery Emergency Fuel Treatment
AMSOIL Diesel Cetane BoostDiesel Cetane Boost

Cleaners and Protectants

AMSOIL Heavy Duty DegreaserHeavy Duty Degreaser
AMSOIL MP Metal ProtectorMetal Protector
AMSOIL Heavy-Duty Metal ProtectorHeavy-Duty Metal Protector
AMSOIL Brake Parts CleanerBrake Parts Cleaner
AMSOIL Engine and Transmission FlushEngine and Transmission Flush

Was this page helpful?

(click on a star to rate)

Blog Title: AMSOIL Synthetic Lubricants For Heavy Duty Diesel Applications
Current Rating: 4.5 out of 5 stars
Votes & Reviews: 1 vote(s) and 1 user reviews.


Share your comments
or ask a question


smaller | bigger

1-855-519-1529

Select your country.

Canada
Ships from Canada. Prices in CA dollars.
United States
Ships from USA. Prices in US dollars.

Price List Request

Receive wholesale price list in your email.