There was a post made with very good info on oil information.
posted by creaZine, he found on another site, NZR: Good basic Oil infoMulti viscosity oils are one of the great improvements in oils, but they should be chosen wisely. Always use a multi grade with the narrowest span of viscosity that is appropriate for the temperatures you are going to encounter. The polymers can shear and burn forming deposits that can cause ring sticking and other problems. 10W-40 and 5W-30 require a lot of polymers(synthetics excluded) to achieve that range.
Very few manufactures recommend 10W-40 any more, and some threaten to void warranties if it is used. It was not included in this article for that reason. 20W-50 is the same 30 point spread, but because it starts with a heavier base it requires less viscosity index improvers (polymers) to do the job. AMSOIL can formulate their 10W-30 and 15W-40 with no viscosity index improvers but uses some in the 10W-40 and 5W-30. Mobil 1 uses no viscosity improvers in their 5W-30, and I assume the new 10W-30.
Kai
 Now a member of the Dark Side TitleTown FL body kit is considered -2 on the stage chart - Guapo 10:36:58 12/14/05 AshsZ in Florida: I'm gonna fire my sh** up today 1/14/06 90% of the time ..plano soccer mom girls are hot the other 15% they are crackwhores...with the overlap. -genic 06/29/06
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