<VV> Motor oil shear strenght comparisons - a good article

[Mark Durham]

Amsoil say you can run some of its oils 25k miles, I have run the Mobil
1 extended interval oil to 15k miles with a oil filter change at 7500,
no issues. Its a matter of the additive package and how long the oil
can be kept clean. Mobil q and Amsoil both were so slick the seals
weeped a bit.
Mark Durham

Sent from my Windows Phone
From: Ron
Sent: 7/18/2012 11:36
To: Joel McGregor; Virtual Vairs
Subject: Re: <VV> Motor oil shear strenght comparisons - a good article
Mercedes recommends Mobil 1 for the Crossfire with a 7000 mile change
interval so they must have a lot of confidence in it.
RonH

----- Original Message -----
From: "Joel McGregor" <joel at joelsplace.com>
To: "Virtual Vairs" <VirtualVairs at corvair.org>
Sent: Wednesday, July 18, 2012 11:20 AM
Subject: Re: <VV> Motor oil shear strenght comparisons - a good article


> There is a huge problem with this test.  It's only on fresh oil which
> might make the results useful for break in oil you are only going to run
> for an hour or less but they are pretty much meaningless for an oil you
> are going to run for 3000 miles.  You might think that if the protection
> starts out high then it will stay higher than another oil but that isn't
> always or even often true.
> The only test I've read where someone tested oil, ran it and tested it
> again failed 3 of the 4 oils tested.  The only one that tested good enough
> to keep running after 750 miles was Mobil1 and it was down 23% in
> viscosity from where it started.  I think Castrol GTX was 2nd ahead of
> Honda fully  synthetic oil if I remember correctly.
> Joel McGregor
> ________________________________________
> From: virtualvairs-bounces at corvair.org [virtualvairs-bounces at corvair.org]
> On Behalf Of Mark Durham [62vair at gmail.com]
> Sent: Monday, July 16, 2012 4:48 PM
> To: Virtual Vairs
> Subject: <VV> Motor oil shear strenght comparisons - a good article
>
> Gents, I searched to see what reactions other flat tappet forums are
> having about the Defy oil. The Corvette Forum has a article by a classic
> car guy who did shear testing on 48 oils, including the Defy 10w30.
>
> 540 RAT's results, as you will see, may change the way you look at oils,
> but keep in mind his focus is on shear strenght, or the ability to prevent
> contact. It really is a good supplement to Richard Widman's article on
> oil.
>
> The article has changed my belief that synthetic oil is actually better at
> protecting your engine. The Industry standard Amsoils and Mobil 1's did
> not
> come out on top in these independent tests, either, and they are good
> oils. Many of todays later generation Dino oils for modern engines did
> very
> well in the shear tests, too. Nor was it consistent that a higher weight
> oil did better over a lighter weight oil.
>
> While the author says there are "no bad oils in the group", the oils at
> the
> top outperform those at the bottom in shear strenght by a staggering
> almost
> 100% margin. That is significant. I think that from now on I will be
> making
> selections at least in the top 10% of the list for all my cars, and add
> the
> ZDDP to that oil as necessary for the Corvair.  By the way, the Defy 10w30
> is in the top 10%, and at 15.64 for 5 quarts, is a great buy.
>
> Enjoy the article.
>
> http://forums.corvetteforum.com/c3-tech-performance/3078239-quaker-state-s-new-defy-motor-oil-lab-test-and-wear-test-data.html
>
> Mark Durham
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