lol I might be interested in buying a 370z and was looking through the forums when I saw this thread.. and I had to sign up just for this lol.. you only need one thing to clean the oil.. GASOLINE.. if you do it while the spill is fresh, it goes out JUST LIKE THAT... if not, a little more elbow grease is needed..

The only thing I've ever used gasoline to clean with was wheel bearings...to get the old grease out before repacking them.