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Old 06-06-2009, 08:54 AM   #1
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Comparison of Motor Oils

https://www.amsoil.com/lit/g1971.pdf

Six Laboratory Tests.

Eleven Oils.

A Good Read.

:thumbsup:
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Old 06-06-2009, 12:57 PM   #2
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Looks a lot like an Amsoil advertisment.
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Old 06-06-2009, 01:16 PM   #3
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If that is your perspective, it is.
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I use and talk about, but don't sell Amsoil.
Who is shatto?
06 4.7 Tundra replaced a 98 Dakota 3.9.
623,000 miles on original engine and transmission, using Amsoil by-pass filters and lubrication.
+Everybody knows something you don't know.
+Artists prove truth can be in forms you don't understand.

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Retired Pro-Hunter featured in; 'African Hunter', by James R. Mellon III. and listed in; Rowland Ward's Records of Big Game.
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Old 06-06-2009, 02:37 PM   #4
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I find it very difficult to take seriously any comparison provided by a company with such a vested interest.
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Old 06-06-2009, 03:07 PM   #5
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Who paid for the test?
What testing facility did the testing?
When I see a bunch of test that test a range of items and see one product that wins them all I think something is up.
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Old 06-06-2009, 04:56 PM   #6
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Quote:
Originally Posted by theholycow View Post
I find it very difficult to take seriously any comparison provided by a company with such a vested interest.
I agree. An independant test not funded or affiliated with a company selling oil would be a more objective test.
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Old 06-07-2009, 04:36 AM   #7
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http://www.carcraft.com/techarticles...oil/index.html...

Over the years, Car Craft has tested many different types of engine components. A common theme underlying many of these tests is that bigger is not necessarily better, especially on the street. But just as many continue to believe in rad cams and giant carbs, traditional, thick, single-viscosity oils still have a strong following among car-crafting traditionalists.

Of course, high-viscosity oils don't flow well at low temperatures. In the old days, guys living in cold climates put in a thinner oil for the winter with a "W" or cold temperature-viscosity rating. Although they poured better at low temperatures, straight-viscosity "W" oils, in turn, didn't do a good job of protecting high-performance engines once they reached normal operating temperatures, so they weren't recommended for sustained high-speed driving. The oil industry developed "all-season" multiviscosity oils to solve the problem, but some of the early products didn't hold up under heavy-duty operating conditions, tainting the reputation of multiviscosity lubricants among many Car Crafters to this day.

Yet today's modern oils are vastly improved over those of 20 years ago. For oils that meet the current "SJ" service designation, viscosity breakdown is no longer a significant problem, thanks to modern formulation technologies and viscosity enhancers. Auto manufacturers have also redesigned their engines for tighter clearances and instituted precision machining techniques that take advantage of thinner oil to deliver improved fuel economy through reduced friction.

Like the OEMs, racers have discovered that friction reductions plus precision tight clearances yield greater efficiency and more power. Racers also know that most engine wear occurs at start-up, so it's critical that engine parts receive proper lubrication as soon as possible--hence the need for an initially thinner, so-called "winter" viscosity. Today, few racers run a single-viscosity motor oil except nitro-burners. According to 76 Lubricants, most NASCAR teams use the really thin stuff during qualifying, moving up to 20W-50 during the long race (although it's rumored some teams may use the extreme cold-weather thin oils all the time, but don't want to admit to their latest performance "trick").



Synthetic oils, pioneered in the '70s by Mobil and now available from most major oil companies, take the all-season, multiviscosity approach to the outer limits. Unlike traditional mineral oils that are produced by distillation and further refining of existing crude oil stock, synthetic lubricants are made through chemical reactions. These new oils aren't synthetic or artificial in the sense that they're manufactured out of whole cloth--they still have the same natural ingredients found in "real" oil. But in a synthetic lubricant, these ingredients are recombined like a Lego set to yield synthesized-hydrocarbon molecular chains with desirable characteristics and uniformity not found in even the highest-quality traditional motor oils. Typically, the best synthetic oils use a combination of up to three different synthetic base fluids--polyalphaolefin (PAO), synthetic esters, and alkylated aromatics.

Because a synthetic oil's molecules are much more consistent in size and shape, they are better able to withstand extreme engine temperatures. By contrast, the unstable molecules in conventional oil can easily vaporize or oxidize in extreme heat. Mobil 1 synthetic is said to be capable of protecting engines "at well over 400 degrees F"; in the real world, most racers have no problem running synthetics up to 290 degrees F under prolonged use, but they get really jumpy when a conventional exceeds 270 degrees F.

Because a synthetic oil is chemically produced, there are no contaminants in the oil. By contrast, conventional oils contain small amounts of sulfur, wax, and asphaltic material that can promote detonation as well as varnish and sludge buildup. With no wax, synthetics will flow at much lower temperatures than conventional oils. In fact, synthetic oils are now available with viscosity ratings as low as 0W-30, as in Mobil 1's new Tri-Synthetic blend or Castrol Formula SLX. These oils flow more than seven times faster than a conventional 5W-30 motor oil during initial start-up, yet at normal operating temperatures act like a regular Grade 30 oil.

An 0W-30 synthetic oil is capable of pumping easily at -62 degrees F and flowing at even lower temperatures. Conventional oils are essentially frozen solid at that temperature, so there's simply no conventional equivalent to this new grade. There are 5W-30 conventional and synthetic oils, but even here, the synthetic has a real-world advantage: Mobil 1's 5W-30 will pump at -58-degrees F, compared to about -35-degrees F for a conventional oil.



But claims and talk are cheap, so Car Craft had Westech Performance run some of the new Mobil 1 0W-30 in Ford's prototype 392 small-block stroker crate engine. The Mobil 1 was compared to the generic (and recommended for this engine) 20W-50 factory-fill conventional oil, as well as 10W-30 conventional oil. All tests began with the oil temperature stabilized at 210 degrees F. The engine ran from 3,300-6,200 rpm, and several runs were made for each oil to ensure repeatability.

In terms of peak numbers, we found that the engine gained nearly 7 hp with the thinner conventional oil, and was up nearly 10 hp with the synthetic. No peak torque gains were observed by changing from 20W-50 to 10W-30 conventional; however, the synthetic was up 15 lb-ft of torque at the peak. Looking at average numbers helps explain where the gains occurred--both the thinner conventional and synthetic oils broadened the torque and power bands overall, but the thin Mobil 1 showed the greatest improvement under 4,700 rpm, indicating that the thinner oil provides less initial drag for the engine to overcome.

However, thinner oil also translates to lower oil pressure: The 0W-30 oil developed 10 psi less than the baseline 20W-50. Only 46 psi was on tap at 6,200 rpm--kind of shaky as most gearheads like to see at least 10 psi per 1,000 rpm. Still, the engine ran OK, and the bearings looked fine on teardown, seemingly verifying synthetic manufacturers' claims that their products' greater shear strength more than makes up for lower viscosity. Is 10 hp and 15 lb-ft worth paying two to four times more for a quart of oil? Or the potential for extended engine life? You be the judge.
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Old 06-07-2009, 07:19 AM   #8
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Thank you.
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I use and talk about, but don't sell Amsoil.
Who is shatto?
06 4.7 Tundra replaced a 98 Dakota 3.9.
623,000 miles on original engine and transmission, using Amsoil by-pass filters and lubrication.
+Everybody knows something you don't know.
+Artists prove truth can be in forms you don't understand.

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Retired Pro-Hunter featured in; 'African Hunter', by James R. Mellon III. and listed in; Rowland Ward's Records of Big Game.
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Old 06-07-2009, 09:02 AM   #9
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one thing that i'd heard and previously dismissed is that amsoil moves and stays to heat. so, it was suggested to check the oil level COLD, otherwise it will give a low reading.

not talking about letting the oil completely drain back into the pan for several minutes after driving. check it when the motor is fully cooled.

i confirmed this by accident when i checked my oil level and found it to be about 1/2 qt low one day. so, i picked some oil up that day, but did not top it off.

the next day, i had the intent to add some oil, but i decided to check the level again. to my suprise, the cold engine needed NO oil.

anyone else experience this w/ other synthetics or dino oil?
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Old 06-07-2009, 01:01 PM   #10
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The oil filter may have drained out (I find that the anti drain back valves don't seal as well as advertised) and some oil in the valve cover would have returned to the pan as the engine cooled- together, this could equal 1/2 a quart.
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