AMSOIL products clearly offer better wear protection than competitive synthetics and much better protection than conventional oils.Engines can fail due to mechanical problems even when using AMSOIL.AMSOIL Motor Oils, however, in over twenty-nine years have never caused an engine failure.If you ever hear someone say AMSOIL caused their engine, bearings, pistons, etc. to fail, they are wrong.

Federal Mogul Corporation, a manufacturer of engine bearings, pistons, connecting rods and other engine parts, studied over 7,000 case histories of bearing distress and engine failure and never found engine oil to be the cause of a failure.Dirt, the number one cause of engine failure, was found to be responsible for 43.4% of failures, and insufficient lubrication, the second most common cause of failure, was responsible for 16.6% of failures.Insufficient lubrication is the general term used when not enough oil gets through to the engine to lubricate it (lack of oil volume).

Some causes of insufficient lubrication include oxidation, oil thickening, sludge, cold temperature related dry starts, etc.These, however, are also areas where AMSOIL motor oils out perform the competition.If an engine breaks down with AMSOIL motor oil in it, it would have broken down sooner using another oil! That's fact!

In regard to AMSOIL Super Duty Oil Filters being inferior to Wix (NAPA) filters based upon visual inspection, AMSOIL Filters have an inner beauty that's not visible to the human eye.Unlike the person who made these comments, the Society of Automotive Engineers recognized that filter performance cannot be evaluated by visual inspection.Therefore, they created the industry standard SAE HS806 test for evaluating oil filters.The SAE HS806 test evaluates particle removal efficiency and contaminant holding capacity which are the two main functions an oil filter must perform.As you can see from the following charts, AMSOIL outperforms the competition in both areas.

The Super Duty Filter has a finer filtering media, more dirt holding capacity, heavier-duty construction and a 6-month/12,500-mile change interval recommendation which is the highest in the industry.Change a Wix (NAPA) filter two to three times as often at half the price and it will cost more.There will also be more and larger particles of dirt in your oil at all times if you don't choose the AMSOIL Super Duty.

From the AMSOIL website


An individual has posted a message on an Internet message board that said AMSOIL motor oils "lack sufficient EP additives" and the quality of the product has dropped" in the last few years. Due to lack of EP additives and the the drop in product quality he "wiped out bearings, pistons, rocker bushings, etc." He also said that AMSOIL Super Duty Oil Filters are inferior to "Wix (Napa) filters that costs half the price!" Is there any truth to this?

No truth whatsoever. AMSOIL INC. has continually improved the performance of its products over the years. The best performing oil we've ever made are the oils we make today. In addition, new technology has allowed us to improve performance as the introduction of our Series 2000 oils demonstrated. Our standard products outperform the competition and the Series 2000 products blow them away.

First of all, extreme pressure (EP) additives are not typically used in motor oil. EP additives are usually found in gear lubricants. These types of additives usually contain sulfur compounds that activate at higher pressures and temperatures than found in engines. In an unactivated state, these compounds react with gases, water and other by-products of combustion to form acids that are corrosive to bearing materials found in engine components.

Engine oils typically use antiwear (AW) additives to prevent metal-to-metal contact within an engine.These are commonly zinc and phosphorus compounds (zincdithiophosphate or ZDP).These additives are different from EP additives because they activate or bond with metal surfaces at lower temperatures and pressures and do not form corrosive acids. EP additives are intended to withstand higher pressures and temperatures than found in engines. AW additives offer more than enough protection for all engine conditions without any of the harmful side effects of EP additives.

AMSOIL INC. has always used higher quality and a higher level of additives including zinc and phosphorus than most motor oils on the market.The attached tables compare the content of zinc and phosphorus of several popular motor oils for passenger car and racing applications.These additive contents were determined using spectrographic analysis. Results could be verified for accuracy by submitting unused oil for analysis to any independent oil analysis laboratory.

Quantity of AW additives alone, however, will not make one lubricant perform better than a competitive lubricant.It's the combination of blended synthetic basestocks with a perfectly balanced package of the highest quality additives that allows AMSOIL to consistently outperform the competition in all aspects including wear protection.(NOTE: Perfectly balanced means that using an aftermarket oil additive will not improve and may actually harm the performance of AMSOIL motor oils.)

The following results from Four Ball Wear Tests will demonstrate how effective AMSOIL Synthetic Motor Oils are at wear protection compared to other popular oils.The Four Ball Wear Test is a lubricant industry standard (ASTM D 4172) test that compares relative wear prevention characteristics of new lubricants at specified conditions.

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