I heard you're not really supposed to switch till around 10k miles. That's when I did it. I use Mobil 1 if it's a do-it-yourself at home oil change, and if I let Mastro do it, usually I get Motul. And the crush washer thing is important. Mine seems to be seeping just a bit of oil w/o a new one, so I suppose I should get a stockpile of them from the dealer next time I'm there.