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What are the viscosity ratings for AMSOIL/Royal Purple? It sounds like it's rather thick, but people seem to swear by them in all sorts of engine applications (BMWs, Honda DOHC VTEC, GM LSx series, you name it).
I'm partial to Mobil 1, 5w-30 (unless GM starts to use 5w-20 like some manufacturers are doing).
I will always change my own oil, even under warranty. I can take my time, and after filling it I always take it for an easy drive around the block for all the oil to circulate, and then check the level again and add if needed - I doubt any Chevy dealer is going to go through that trouble.
Under warranty if anything goes wrong I will obviously take it to the dealer, but after that I will do all of my own maintenance and repairs within reason. Things I can't do myself (tires) I take to someone who can do it right (i.e. understands how to mount/remove tires with TPS sensors) without charging an arm and a leg (dealers are typically the most expensive when it comes to this stuff).
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