Sell my X308 with the V8 engine

What do you think with 150.000 km for which price i can sell the car? Or anyone els can give me his opinion?

There's a lot more to it than just the mileage. There's the maintenance history, the shape of the body, paint, any other issues, wear & tear on the interior and so forth. Best bet would be to check online classifieds and try to find something relatively close in condition and mileage and give a guess from there.