Red Line 5w30 vs Mobil 1 on final warranty service...
 

Been using M1 since 11000 miles, now at 22000. Any comments re; pro/cons, advantages of RL vs old/new M1?

Some evidence that Amsoil is best...
 

<center><img src="http://amsoil.com/graphs/0w30GIF_600px.gif"></center><p><A HREF="https://forums.audiworld.com/s4/msgs/891640.phtml">Amsoil reduces oil temperature</A>
<A HREF="https://forums.audiworld.com/s4/msgs/889510.phtml">Amsoil and Redline oils and choice of weights</A>
<A HREF="https://forums.audiworld.com/a6/msgs/183006.phtml">Amsoil recommends 6 mo. change interval for 0W30 when used in turbo/superchg engines</A>
<a href="https://forums.audiworld.com/s4/msgs/407320.phtml">Synthetic oil brands</a>
<A HREF="https://forums.audiworld.com/a6/msgs/180630.phtml">Mobil 1 vs Amsoil synthetics (Jon C)</A>
<a href="http://www.amsoil.com/products/asl.html">Amsoil SAE 5W-30 Synthetic Motor Oil</a>
<a href="http://amsoil.com/products/tso.html">Amsoil Series 2000 0W-30 Synthetic Motor Oil</a>
<a href="https://forums.audiworld.com/tt/msgs/128979.phtml">Short treatise on MOTOR OIL, weights, and synthetic oil</a>
<a href="http://intershop.amsoil.com/cgi-bin/Amsoil.storefront/3c8e9c5302d9bef2271cd1f0e3f0073a/Catalog/1124">AMSOIL Storefront</a>
<a href="http://www.4unique.com/lubrication/lubrication_tutorial.htm">Lubrication tutorial engine oil/motor oil, synthetics, etc...</a>

You can buy M1 0W-40 at AutoZone now - that's a plus. No special orders or Mercedes Dealers, etc.

I 2nd the amsoil vote. 0w30 series 2000 is what you want.

This comparison chart is probably meaningless in predicting engine wear.
 

In normal operation there is no metal to metal contact of bearing surfaces in a car engine. The bearings are hydrodynamic and, assuming you are using the correct viscosity oil, the bearings "float" on a film of oil that is formed by the bearing surfaces moving past each other, with oil between them. The effect is similar to a water skier traveling over water. Oil pressure, as read on the oil pressure gauge, has no effect on the thickness of this film. Only the viscosity of the oil and the speed of the bearing surface enters into the equation. The designer of the bearings in a car engine has to ensure that, under no circumstances, will the oil film become thinner than the surface irregularities so that there is no metal on metal contact.

The test that Amsoil did was one where excessive pressure was placed on a bearing to force metal to metal contact (something that only happens during startup). They probably have a bunch of moly, or some other high pressure lubricant, that reduces wear when there is contact so they do better in this test. These type of lubricants ar often used in assembly lubricants, and possibly in break-in oils, to help lubricate the engine during the first run of the engine when there is no oil yet in the bearings.

The bottom line is that the test has essentially no significance in predicting engine wear.

Just another bit of info. A common misconception about engine lubrication is that low oil pressure somehow causes poor lubrication and increases engine wear. As long as there is sufficient oil pressure to keep the bearing surfaces full with oil it makes no difference how much oil pressure you have, high or low. Now zero pressure is bad because it means no oil is getting to the bearing at all. Low oil pressure may be bad because it can indicate that the pump is wearing out or that bearing clearances are increasing to the point that the pump can no longer supply enough oil to keep them full.