AMSOIL EAO Oil Filter.

Synthetic 5W-40 Premium Diesel Engine Oil

AMSOIL Synthetic 5W-40 Premium Diesel Oil (DEO) is the premium choice diesel oil for model year 2007 and newer heavy-duty and pickup truck diesel engines requiring API CJ-4 emission quality oil standards. New motor oil standards apply to the new 2007 Cummins, Powerstroke and Duramax diesel pickups with more restrictive diesel emission requirements.

AMSOIL Synthetic 5W-40 Premium Diesel Oil (DEO) is a better choice for all older diesel trucks. This new oil has a broad viscosity range making it suitable for a broad range of seasons and locations.

AMSOIL Synthetic 5W-40 (DEO) is the premium choice for API CJ-4 emission quality diesel oil required by model year 2007 and newer diesel engines. It delivers extraordinary lubrication in diesel engines found in commercial, fleet and personal vehicles. Built with the latest additive and synthetic base oil technology, AMSOIL Synthetic 5W-40 Diesel Oil exceeds the higher performance demands of modern engines. It withstands the stress of heat, soot and acids to help prevent deposits, corrosion and wear. AMSOIL Synthetic 5W-40, with its broad viscosity range, is ideal for winter and summer use. It resists breakdown and can extend drain intervals when monitored by oil analysis.

AMSOIL Synthetic 5W-40 Premium Diesel Motor Oil
API Service CJ-4, CI-4+, CH-4, CF
Product Code: DEO

NEW! AMSOIL Online Product Information Guide
Click to find all recommended AMSOIL products, 
filter sizes and lubrication capacities for your vehicle.

Don't forget the Ultimate Oil Filter for Engine Protection.

AMSOIL's best oil filter is the new Ea Oil Filters featuring advanced full synthetic nanofiber technology.

AMSOIL Ea Oil Filters are made with premium-grade full synthetic media. The strictly controlled processing of this media ensures accurate filter construction, and is what allows Ea Oil Filters to deliver higher capacity and efficiency along with better durability.

Synthetic Diesel and Marine Engine Oil

AMSOIL Synthetic Diesel and Marine Engine Oil gives outstanding protection. Specifically blended long-life formulation resists oxidation and thermal breakdown. Retains viscosity and reduces sludge and varnish formation. Outstanding lubricity provides unbeatable wear protection and maximum fuel efficiency. Twelve TBN formula fights corrosion. Contains special performance additives for acid and soot control. Extended drain capability reduces downtime and motor oil expenses.

AMSOIL Synthetic 15W-40 Heavy Duty
Diesel and Marine Motor Oil
API Service CG-4, CF, CF-2, SH, SJ
Product Code: AME

AMSOIL Synthetic Diesel Motor Oil
SAE 30 API Service CF, CF-2, SH, SJ
Product Code: ACD

AMSOIL Semi-Synthetic Diesel Motor Oil
SAE 15W-40 API Service CF, CF-2, SH, SJ
Product Code: PCO

NEW! AMSOIL Online Product Information Guide
Click to find all recommended AMSOIL products, 
filter sizes and lubrication capacities for your vehicle.

Series 3000 Synthetic 5W-30 Heavy Duty Diesel Oil

AMSOIL Synthetic Series 3000 5W-30 Heavy Duty Diesel Oil, formulated for diesel and gasoline engine use, offers a combination of engine protection and fuel economy unmatched by other oils. Independent lab tests show Series 3000 outprotects other popular diesel oils - even 15W-40 grade oils - by a wide margin (see graph below).

Series 3000 improves fuel economy. Testing performed by an independent facility showed that class 8 trucks with AMSOIL Series 3000 in the engines and AMSOIL synthetic lubricants in the drivetrains obtained up to 8.2 percent more mpg than matched trucks lubricated with conventional products.

Series 3000 Synthetic Heavy Duty Diesel Oil
SAE 5W-30 API Service CG-4, CF, CF-2, SH, SJ, ILSAC GF-2
Product Code: HDD

Ideal for use in

Gasoline Engines


Diesel Engines

Synthetic High Performance Motor Oil

AMSOIL Synthetic High Performance Motor Oils dramatically outperforms conventional petroleum motor oils. This high performance formula is for both gasoline and diesel engines. Reduces friction, heat and wear for maximum power, performance and fuel efficiency. Resists high temperature burn-off, chemical breakdown and sludging to keep engines cleaner. Outstanding low temperature fluidity for fast, dependable winter starts and immediate start-up protection. Up to 25,000-mile or 1-year drain intervals.

Synthetic 10W-40 High Performance Motor Oil
API Service SJ, SH, SG, SF, CH-4, CG-4, CF-2, CF, CD
Product Code: AMO

  • ACEA A-2, A-3, B-2, B-3, E-2, E-3
  • Chrysler MS 8809A
  • Cummins CES 20071, 20072, 20076
  • Mercedes Benz AG 226.1, 227.1, 228.1, 228.3
  • Mach EO-L, EO-M, EO-M+
  • Volkswagon 501.01, 505.00
  • Allison C-3, C-4
  • Caterpillar TO-2, TO-3
  • Volvo VDS, VDS-2

Synthetic 20W-50 High Performance Motor Oil
API Service SJ, SH, SG, SF, CH-4, CG-4, CF-2, CF, CD
Product Code: ARO

AMSOIL Diesel Fuel Additive Concentrate

AMSOIL Diesel Concentrate has been reformulated with additional lubricity properties. Reduces fuel pump and injector wear. The new AMSOIL Diesel Concentrate (ADF) is a total system cleaner and lubricity improver for all types of diesel engines, including automotive, light truck, heavy duty and marine applications. AMSOIL Diesel Concentrate compensates for the quality variances of different fuels (including biodiesels) and the deficiencies of today’s ultra low sulfur diesel fuel (ULSD) for better engine operation.

Cleans Injectors, Improves Fuel Economy and Restores Horsepower

Diesel engines become less efficient over time. Fuel injector deposits interrupt spray patterns, causing poor fuel atomization, incomplete combustion, excessive emissions and smoke. Tests prove that AMSOIL Diesel Concentrate cleans dirty injectors, not only improving fuel economy by up to five percent, but also restoring horsepower to like new. Acceleration is improved, and with regular use, AMSOIL Diesel Concentrate continues to enhance performance by keeping injectors clean. One bottle treats 80 gallons of diesel fuel.

Product Code: ADF

AMSOIL Diesel Fuel Cold Flow Improver

Combining AMSOIL Diesel Concentrate with a cold flow improvement property is not cost effective in the summer months, or to AMSOIL customers who live in the south. To keep costs down for customers, AMSOIL Diesel Concentrate (ADF) no longer includes a cold flow improver. Instead, AMSOIL provides new AMSOIL Diesel Cold Flow Improver (DFF) for low-temperature applications below 40°. Designed for automotive, light truck, heavy duty and marine applications.

Product Code: DFF

AMSOIL Cetane Boost

AMSOIL Cetane Boost increases cetane by three to seven numbers. It contains fuel cetane enhancers, which increase startability, combustion efficiency and power, and decrease engine knock, smoke and emissions.

AMSOIL Diesel Fuel Additive Concentrate and Cetane Boost are compatible and may be mixed in the fuel tank. Both are alcohol-free for seal and coomponent compatibility.

Product Code: ACB

Diesel Fuel Modifier

AMSOIL Diesel Fuel Modifier improves combustion, fuel efficiency, cold-weather starting, power and performance. Cleans injectors, fuel screens, pumps and filters. For use in diesel-powered cars and light-duty trucks. Treats up to 40 gallons.

Product Code: ADM

Performance Features

  • Improves fuel economy
  • Extends injector life
  • Increases fuel stability
  • Reduces emissions
  • Improves cold fuel flow
  • Improves cold startability
  • Controls injector wear
  • Compatible with AMSOIL Cetane Boost

Oil Analysis Kits

The oil analysis process consists of (1) lubricant sampling, (2) laboratory analysis and (3) interpretation of the results to determine the condition of the fluid and the machinery from which the sample was taken. An oil analysis program can provide critical information for any equipment requiring lubricants-both gasoline and diesel engines, transmissions, gears, bearings, and hydraulic systems. It's useful for owners of passenger cars, over-the-road fleets, off-highway equipment, boats, or high performance vehicles.

Make the decision to use Oil Analyzers, Inc. (OAI) to test the lubricants in your equipment or fleet and you'll be partnering with the most advanced computerized testing laboratory today's technology has to offer. Simply collect your samples using our sampling kits and mail them in our pre-addressed packages to our lab. Kits are available with or without return postage. Our technical team will do the rest.

Testing is typically completed by the end of the business day following receipt of your sample. Results are reported by fax, mail, or in the case of an impending equipment failure, by telephone. Reports are easy to read and include interpretation and recommendations.

Product Codes:
G-1451 1 Sample Kit
G-1452 10 Sample Kits
G-1453 25 Sample Kits
G-1454 50 Sample Kits
G-1455 100 Sample Kits

Auto Gas Engines Diesel Engines Motorcycles 2-Cycle Engines
Racing Filters Transmissions Gear Oils
Greases Farming Construction Accessories

If you would like more information about AMSOIL INC., click one of the links below:

Mailing address:

Kent R. Rieske
5086 Cottonwood Drive
Boulder, CO 80301 USA
Phone: (303) 927-6937
Fax: (303) 953-9725

E-mail address:

This web site home address:

How to place telephone orders for AMSOIL products and literature, and frequently asked questions (FAQ).

Copyright © 2000 - 2012 and AMSOIL INC.

Click to shop or browse AMSOIL's online store.