I guess we shouldn't worry about it as long as we're still in warranty. Currently my car only does it at low rpm and high load (lugging basically), so I can't really get out of the car and see where it's coming from. I'll be trying out a new oil (castrol magnatec 0w20) soon and I'll see if that helps at all. If not I might try out a heavier weight oil next time. There is another thread somewhere on that subject, and several people have already gone that route as well.