Have you overfilled with oil? I was silly and not only did I fill mine to 0.5cm past "FULL" (when reading from the dipstick), but I did it when the engine was only half-warm, ie below normal operating temp. It had lost a bit of oil since I hit a wombat, and as a result I needed to put in 2.5L. I think I put in 500ml too much though. Anyhoo, bits of the engine are covered in oil now, and my driveway resembles an art project
-Dave-