that made it's way that far down the exhaust tract, maybe you've just got a problem with leftover oil being burned off, since you said the car is running fine. If your leak down test doesn't indicate any problems, take the car out on the interstate for 1/2 hour or so of steady cruising, 65/70 mph to try and get the temps up at operating temperatures for an extended period which should help to burn that off. Although if you've still got Cats and oil made it past them, imagine how much may have gotten caught in the Cats. Could take a while to burn it all off.
