Oil Loss Volvo 2010 S 80 3.2 V6. (34K)

After changing my oil, I have been driving for about 4300mil and the computer light came on Oil Level Low. I turned it off and drove @ next msg. the same. I look at the oil stick and the oil is under the minimum, I had to replace 2q of oil. Took it to the dealer, can't find anything wrong! right? where did the 2 q of oil gone? no oil licks that I can see. Dealer tells me there is no recall (tj24411) what a bunch of BS. Tells me to drive it for 2500 mil until the service is required and if that happens again they will look into it.
Anyone had a similar problem? please let me know what the solution is.

 

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