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LNG Publishing Magazine

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In the March 2003 issue of Lubes 'n' Greases, Automotive Editor David McFall wrote an in-depth article on the subject of extended oil drain intervals and touted AMSOIL as a safe, cost-effective and environmentally preferred choice. He praised AMSOIL for their commitment to excellence and labeled AMSOIL "unshackled" for never conforming to industry norms and standards.

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Compare AMSOIL to Mobil 1, Pennzoil, Quaker State, Castrol and more!

AMSOIL 10W-30 Motor Oil and ten competing oils were subjected to a series of tests. AMSOIL  outperformed all the competitors in nearly every test! See the impressive test results!

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AMSOIL Synthetic 5W-40 Premium Diesel Oil

AMSOIL 5W-40 Synthetic Diesel Oil

Premium Choice Diesel Oil for Newer Diesel Engines Requiring API CJ-4 Standards

AMSOIL Synthetic 5W-40 Premium Diesel Oil 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. AMSOIL 5W-40 Diesel Oil delivers extraordinary lubrication in diesel engines found in commercial, fleet and personal vehicles. Built with the latest additive and synthetic base oil technology, AMSOIL 5W-40 Diesel Oil exceeds the higher performance demands of modern engines.

  • Exceeds modern emission requirements
  • Resists soot contamination
  • Reduces engine wear
  • Maximizes fuel economy
  • Reduces oil consumption
  • Resists sludge formation
  • Ideal for winter and summer use
  • Improves cold temperature flow
  • Replaces 5W-40, 10W-40 and 15W-40 viscosity oils
  • Backwards compatible with pre-2007 diesel and gasoline engines
  • Drain interval can be extended with monitored oil analysis
Locate an AMSOIL Retailer in New York State
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Exceeds Emission System Requirements

AMSOIL Synthetic 5W-40 Premium Diesel Oil is a low sulfated ash formulation that exceeds the modern requirements for low emission quality diesel oil. It is compatible with all exhaust treatment devices and is designed to extend the service life of particulate filters.

Controls Soot Thickening and Wear

The advanced synthetic base oils in AMSOIL Synthetic 5W-40 Premium Diesel 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 wear is controlled.

Maximizes Fuel Economy and Reduces Oil Consumption

AMSOIL Synthetic 5W-40 Premium Diesel Oil has a very low high temperature volatility rate (burn off). Because less oil vapor passes into the combustion chamber, oil consumption and emissions are reduced. Additionally, lower volatility helps AMSOIL 5W-40 Diesel Oil retain its viscosity after high temperature service for continued dependable protection and excellent fuel economy.

Excels in Extreme Temperatures

AMSOIL Synthetic 5W-40 Premium Diesel Oil resists thermal (heat) breakdown, oxidation and sludge formation better than conventional petroleum oils. And unlike conventional oils, AMSOIL 5W-40 Diesel Oil contains no wax. It stays fluid in cold temperatures for improved oil flow, reduced bearing wear and easier starting.

Service Life

AMSOIL Synthetic 5W-40 Premium Diesel Oil is recommended for use according to the longest service interval established by the OEM (Original Equipment Manufacturer). Drain intervals may be extended when monitored by oil analysis.

Oil Filter Service Intervals

Install a new oil filter at time of oil change.

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

Good to Know

  • For best results, use AMSOIL Engine Flush before installing AMSOIL synthetic motor oil.

  • For maximum engine protection, use an AMSOIL Ea™ Oil Filter and an AMSOIL Ea™ Air 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 install them yourself.

Applications

AMSOIL Synthetic 5W-40 Premium Diesel Oil replaces 5W-40, 10W-40 and 15W-40 viscosity oils. It is “backwards compatible” with pre-2007 diesel engines and is recommended for newer and older diesel and gasoline engines, including those under warranty, and other applications requiring the worldwide 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 this product.

 
AMSOIL Synthetic 5W-40 Premium Diesel Oil
Product Code

Pkg./Size

DEOQT-EA Quart Bottle
DEOQT-CA Quart Bottles (case of 12)
DEO1G-EA Gallon Bottle
DEO1G-CA Gallon Bottles (case of 4)
DEO30-EA 30-Gallon Drum
DEO55-EA 55-Gallon Drum

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Check It Out!Check Out the AMSOIL Online Product Application Guide

Want to know which engine oil, transmission oil and gear lube is appropriate for your vehicle and the quantities required? Need to find the correct product codes for your vehicle's filtration requirements? Or, do you have a manufacturer part number of the filter you are currently using and would like to cross reference it? The AMSOIL Online Product Application Guide is the place with the answers!

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AMSOIL, the leader in automotive synthetic lubrication, produced the world’s first API-qualified synthetic motor oil in 1972. Trust the extensive experience of AMSOIL, The First in Synthetics®, to do the best job protecting your engine.

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