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Oil is pretty much mostly the same as far as brands are concerned, except for the differences between conventional and synthetics. Now racing oil is different, because it has alot of zinc added to it to help protect your engine. But it wreaks havoc on your emissions system, and could ruin your catalytic converter.
As far as weights, 10w-30 is fine. Most GM V6's recommend you to use 10w30, but 5w30 is good too if you live in a colder area.
But when it comes to differences between brands, if you're just buying a quart of conventional 10w30, it doesn't really matter if you buy a name brand, even the generic oils come from major brand name oil companies.
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