Amsoil Informational Articles

Amsoil Vs Mobil 1 Extended Performance


“Nothing Performs Like Mobil 1 or Nothing Outperforms Mobil 1”

These are the slogans for Mobil 1 – ExxonMobil.  While quite catchy, how well do they hold up?

Mobil 1 had a 25,000 Mile Full Synthetic Oil Back In 1974

Mobil 1 marketed and sold a full synthetic oil back in 1974 with 25,000 mile extended drain intervals. Here is a link to the information on the Wikipedia site. Mobil 1 25,000 Mile Synthetic Oil A 25,000 mile oil from Mobil back in 1974. I find it interesting that they did continue to sell the oil but did not openly market it as a 25,000 mile oil.

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Motor Oil Viscosity Grades Explained


How do you read the SAE Viscosity rating on your Motoroil?

How do they come up with this rating and what do I need to know to make the right decision before buying oil?

The focus of this article is to guide you down a path to clear and concise easy to read document that will leave you with a better understanding of motor oil viscosty, what it means, and the tests used to classify an oils viscosity.

Learn More About Oil Viscosity

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Fuel Dilution Surfaces as Issue in Some Modern Diesel Applications


AMSOIL has documented two separate fuel dilution issues in modern diesel applications, one of which has forced the company to reduce its drain interval recommendations in a few applications using Premium CJ-4 Synthetic Diesel Oils (DEO, DME).

Fuel Dilution
Fuel in the oil reduces the oil’s life expectancy and effectiveness. Because diesel fuel is a natural solvent, fuel dilution in motor oil causes a decrease in viscosity which may lead to an increase in engine wear. The following can occur if fuel enters the crankcase and contaminates the oil:


Read More…Diesel Engines Shown To Have Fuel Dilution Problems

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Maximum Viscosity Protection


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.


Read More…Shear Stable Diesel Oil

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Engine Oil Additves With Chlorine May Cause Engine Damage


Reprinted Amsoil TSB: MO-2010-04-01 Reprinted from 4/22/10 – AMSOIL INC., AMSOIL Bldg., Superior, WI 54880 (715) 392-7101 © Copyright 2010

Subject: Chlorine-containing potentially corrosive aftermarket engine oil treatments


Read More…Using Engine Oil Additives May Damage Your Engine!

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Oil Life Monitoring Systems


Many motorists today are confused. For several years General Motors, BMW and Mercedes-Benz have been installing monitors on their dashboards that light up to indicate when it’s time to change oil. GM monitors have frequently allowed motorists to drive 5,000 miles and as much as 7,000 miles or more before signaling that it’s time to change oil. The Mercedes-Benz service system indicates 10,000- to 20,000-mile oil change intervals.Naturally, this flies in the face of the 3,000-mile drain recommendation that oil companies insist are necessary to protect engines.


Read More…Oil Changes At 3000 Miles Are A Thing Of The Past

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You Don’t Need To Change Your Oil Every 3,000 Miles!  You Just Need A Good Quality Oil..Read On

Oil Drain Intervals On The Rise

February 2006

The 3000 mile oil change interval has been ingrained in the American consciousness for decades. Conventional motor oil companies aggressively push it, oil change centers remind their customers to return when another 3000 miles have accumulated on the odometer and fathers teach their children to change their oil and filter according to a 3000 mile schedule.


Read More…25,000 Mile OR 1 Year Oil Changes

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Warranties and Amsoil


Virtually all automobile manufacturers warrant their vehicles to remain free of defect in manufacture or workmanship for a certain mileage or time period. Whether an automaker will honor a warranty claim depends on the vehicle owner providing proper maintenance for the vehicle. For this reason, it is important for vehicle owners to maintain maintenance records. Proper maintenance includes installing appropriate oil and filters.


Read More…Automakers Deny Warranty Claims

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