God, I hate these discussions on regular car forums, they are always so full of speculation, rumor, and outright misinformation. I'm trying to stay out of it, but I'll just chime in about 5W-30 vs 10W-30. They are both 30 weight oils, so what does it matter?!? The 5W will be thinner at very low temps, but that's it.

If anyone's actually interested in learning about engine oils, go to the forums on www.bobistheoilguy.com