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Date: Tue, 08 Jun 1999 23:45:07 GMT
From: "Robert L. Davis" <iclicknopsam.com>
Subject: Re: Engine Oil


> ...dyno test done by Fast Fours & Rotaries not too long ago > that did a comparison > of a bunch of top-of-the-line synthetics including AMSOIL and > Royal Purple. Their > conclusion is listed below and you can see the entire article > at this URL: I checked the URL and the test is vague and lacking in details, not to mention the fact that "Amsoil" banners are plastered throughout its pages, including a menu item called "Why Amsoil?" There is also a list of links, many of which are Amsoil oriented. One of them is "AMSOIL President Inducted into Lubricants World Hall of Fame." It appears to be an advertisement for Amsoil rather than a definitive test. Had they been more specific about their testing methods and specifically which oils they used, it would be easier to discern the validity of their tests. They fail to describe, for instance, what the "wear metal test" consisted of. What was the procedure used and what does "Overall (micron)" mean? I've seen Falex tests and Timkin Load Bearing Tests (D-2782)--sanctioned by ASTM, SAE, and API--comparing RP and other synthetics including Amsoil, and RP outperforms them all on those tests. Is the test performed on the website you mention, whatever that test may be, accepted by international organizations such as those listed above? If so, what is this mysterious test? Even more vague are the entire results of the horsepower test, provided here in its entirety. FFR averaged three runs per oil, noting power figures at 500 rpm increments between 3000 and 5000 rpm and noting peak power and torque. While the engine FFR used for testing was a large toleranced engine for which a 20W-50 grade oil is ideal, some of the oil manufacturers supplied 0W-30 grade oils for testing. The low grade viscosity oils delivered somewhat greater horsepower than the high grade oils did, but as FFR notes, "around 4000 rpm the power produced is very similar across the range, and it's only really at the top end where there are substantial differences. That said, the AMSOIL (20W-50), Castrol R (10W-60) and Mobil 5W-50 prove themselves very well." Excuse me, but what were the results? It sounds like perhaps they'd prefer we didn't know, as they certainly didn't tell us anything. I don't intend to denigrate Amsoil in any way, as I consider it an excellent lubricant. It's just that from the tests I've seen that show RP superior to other oils and testimonies I've heard in racing environments and elsewhere, I think Royal Purple multigrade at $3.50-$5.00/quart may be the better deal than some others that cost twice as much, especially considering the empirical results.

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